per 是什么意思

On February 14th, the self-driving car, travelling at 2 miles per hour, pulled out in front of a public bus going 15 miles per hour.

出自-2017年6月听力原文

The report warns that 200 million poor workers are at risk of joining the ranks of people living on less than two dollars per day in the past three years.

出自-2016年6月听力原文

If we replaced half of our administrative staff with classroom teachers, we might actually get a majority of our classes back to 20 or fewer students per teacher.

出自-2016年12月阅读原文

But this doesn't necessarily translate to real cooking, and the result of this survey shouldn't surprise anyone: 52% of those 65 or older cook at home five or more times per week; only a third of young people do.

出自-2015年12月阅读原文

And although you don't read about this much, the United States is also a large exporter of oil products, selling about 2 million barrels of petroleum products per day to about 90 countries.

出自-2014年6月阅读原文

Marriott had its worst quarter ever, with revenues per room falling by 25%.

出自-2013年6月阅读原文

billion in American high schools, helping to open about 1,000 small schools-most of them with about 400 kids each with an average enrollment of only 150 per grade, About 500 more are on the drawing board.

出自-2012年6月阅读原文

Houses built before 1939 use about 50% more energy per square foot than those built after 2000, mainly due to the tiny cracks and gaps that expand over time and let in more outside air.

出自-2010年6月阅读原文

Caught in the Web A few months ago, it wasn't unusual for 47-year-old Carla Toebe to spend 15 hours per day online

出自-2010年6月阅读原文

In Lagos, foreign oil workers can pay as much as $65,000 per year in rent for a modest apartment in a safe part of town.

2017年12月四级真题（第三套）阅读 Section C

That’s the conclusion of a recently released study, which analysed 259 bottles from 11 brands sold in nine countries, revealing an average of 325 plastic particles per litre of water.

2019年12月四级真题（第二套）阅读 Section A

The fifth largest city in US passed a significant soda tax proposal that will levy 1.5 cents per liquid ounce on distributors.

2019年12月四级真题（第一套）阅读 Section C

2 million barrels per day to the crude oil market, contributing to a global over-supply.

出自-2017年6月阅读原文

With fertilizer prices jumping nearly 50% per metric ton over the last year in some places, human waste is an attractive, and often necessary, alternative.

出自-2016年6月阅读原文

Today, energy storage is a $33 billion global industry that generates nearly 100 gigawatt-hours of electricity per year.

出自-2016年12月阅读原文

These less- stressed workers gained an average of 62 minutes per week of productivity.

出自-2016年12月阅读原文

Recent polls by the Pew Research Centre in Washington, DC, found that 75-80 per cent of participants regarded climate change as an important issue.

出自-2015年12月阅读原文

Per-capita local government spendingIn other words, communities with high levels of per-capita income growth, high percentages of two-parent families, and high local government spending—which may stand for good schools— are the most likely to help poor children relive Horatio Alger's rags-to-riches story.

出自-2015年12月阅读原文

Per-capita ( ' , 人均 ) income growth 2.

出自-2015年12月阅读原文

For a middle-class, husband-and-wife family (average pretax income in 2009: $76,250), spending per child is about $12,000 a year

出自-2013年12月阅读原文

Today, we produce about four billion metric tonnes of food per year

出自-2013年12月阅读原文

trillion m3of water is used by humans per year.

出自-2013年12月阅读原文

Let's see, Group C, three to five days hire with unlimited mileage is 53 pounds per day.

出自-2014年6月听力原文

For Group C cars is 6 pounds per day

出自-2014年6月听力原文

We can invent computers capable of processing ten million calculations per second.

出自-2013年12月听力原文

The price is ￡60 per person including a continental breakfast.

出自-2013年6月听力原文

Parking rates will be attracted about $400 monthly or $25 per day, according to Ari Milstein, the director of planning for Automation Parking Systems, which is the U.S. subsidiary of a German company.

出自-2013年6月听力原文

I always tell people to make sure they're drinking enough fluids, which for the average person is 60 to 70 ounces a day, which translates into eight 8-ounce glasses of water or liquid per day.

2019年12月六级真题（第二套）阅读 Section B

In 2005, as the authors observe, real consumption per person in France was only 60% as high as the U.S., making it appear that Americans were economically much better off than the French on average.

2018年6月六级真题（第三套）阅读 Section C

It reproduces incredibly quickly, breeding up to 12 generations per year if conditions are favorable.

2017年12月六级真题（第一套）阅读 Section A

Mothers who slept in the same room as their infants, whether in the same bed or just the same room, had poorer sleep than mothers whose babies slept elsewhere in the house: They woke up more frequently, were awake approximately 20 minutes longer per night

2016年6月六级真题（第一套）听力 Section B

Participants in the study were separated into two groups—one group was asked to eat 30 grams of protein per meal in the form of whole foods.

2019年12月六级真题（第二套）阅读 Section B

Resurrection plants, defined as those capable of recovering from holding less than 0.1 grams of water per gram of dry mass, are different.

2018年6月六级真题（第一套）阅读 Section B

The advent of new technologies has added about 4.2 million barrels per day to the crude oil market, contributing to a global over-supply.

2017年6月六级真题（第一套）阅读 Section B

The bird Clark's nutcracker, for example, hides up to 100, 000 seeds per year, up to 30 kilometers away from the seed source, and has a very close symbiotic(共生的) relationship with several pine species, most 32 notably the whitebark pine.

2016年12月六级真题（第一套）阅读 Section A

These less-stressed workers gained an average of 62 minutes per week of productivity.

2016年12月六级真题（第一套）阅读 Section B

Those spending 10-19 hours per week on their devices were 41 percent more likely to be unhappy than lower-frequency users.

2019年12月六级真题（第一套）阅读 Section B

Today, energy storage is a $33 billion global industry that generates nearly 100 gigawatt-hours of electricity per year.

2016年12月六级真题（第一套）阅读 Section C

When Liu, the UCLA sleep researcher and professor of medicine, brought chronically sleep-restricted people into the lab for a weekend of sleep during which they logged about 10 hours per night, they showed improvements in the ability of insulin to process

2015年12月六级真题（第二套）阅读 Section A

While by no means perfect, it is considerably more comprehensive than average income, taking into account not only growth in consumption per person but also changes in working time, life expectancy, and inequality.

2018年6月六级真题（第三套）阅读 Section C

with fertilizer prices jumping nearly 50% per metric ton over the last year in some places, human waste is an attractive, and often necessary, alternative.

2016年6月六级真题（第二套）阅读 Section C

Americans eat only about fifteen pounds of fish per person per year, but we eat twice as much fish in restaurants as at home.

2016年高考英语全国卷3 阅读理解 七选五 原文

Before the tool came out, small farmers couldn't touch the price per pound offered by California farms.

2018年高考英语江苏卷 阅读理解 阅读C 原文

But during the next week, set a goal of at least a mile and a half per run.

2015年高考英语全国卷2 阅读理解 七选五 原文

But the amount of time spent in reading each session has declined, from closer to an hour or more to closer to a half hour per session.

2018年高考英语全国卷2 阅读理解 阅读C 原文

How much will the woman pay for her room per night?

2016年高考英语江苏卷 听力 题设

How much will the woman pay her room per night?

2016年高考英语全国卷1 听力 题设

It enables small-scale farmers to harvest 175 pounds of green vegetables per hour—a huge improvement over harvesting just a few dozen pounds by hand—suddenly making it possible for the little guys to compete with large farms of California.

2018年高考英语江苏卷 阅读理解 阅读C 原文

It flies using a 23-gallon tank of gas and bums 5 gallons per hour in the air.

2017年高考英语全国卷2 阅读理解 阅读C 原文

Oh, you get one day per month in your first year.

2019年高考英语全国卷2 听力 原文

On the ground, it gets 35 miles per gallon.

2017年高考英语全国卷2 阅读理解 阅读C 原文

Our intensive course builds on our standard course, with 10 additional lessons per week, guaranteeing the fastest possible language learning see table below.

2016年高考英语天津卷 阅读理解 阅读A 原文

People who eat slowly tend to consume about 70 fewer calories per meal than those who rush through their meals.

2015年高考英语全国卷2 阅读理解 阅读B 原文

Statistics show that the average number of births per woman has fallen from 4.

2017年高考英语江苏卷 任务型阅读 原文

Students who are found with pets, whether visiting or owned by the student, are subject to an initial fine of $100 and a continuing fine of $50 a day per pet.

2015年高考英语天津卷 阅读理解 阅读A 原文

The average number of electronic devices rose from 4 per household in 1992 to 13 in 2007.

2018年高考英语全国卷I 阅读理解 阅读D 原文

The new rate is $199 per night, instead of the original $179.

2016年高考英语全国卷1 听力 原文

The price is with a registration fee of just $50 per child?

2015年高考英语福建卷 阅读理解 阅读C 原文

The synapses in the mice taken at the end of a period of sleep were 18 per cent smaller than those taken before sleep, showing that the connections between neurons weaken while sleeping.

2017年高考英语北京卷 阅读理解 七选五 原文

The transition, which flew at 1, 400 feet for eight minutes last month, can reach around 70 miles per hour on the road and 115 in the air.

2017年高考英语全国卷2 阅读理解 阅读C 原文

They customers-some thirty Parisians who pay just under $2 plus drinks per session-care quick to intellectualize(高谈阔论), slow to open up and connect.

2015年高考英语全国卷1 阅读理解 阅读D 原文

Americans, she finds, buy roughly 20 billion garments a year – about 64 items per person – and no matter how much they give away, this excess leads to waste.

出自-2013年考研阅读原文

But the Nobel Foundation’s limit of three recipients per prize, each of whom must still be living, has long been outgrown by the collaborative nature of modern research—as will be demonstrated by the inevitable row over who is ignored when it comes to acknowledging the discovery of the Higgs boson.

出自-2014年考研阅读原文

That common-sense change enjoys wide public support and would save the USPS $2 billion per year.

出自-2018年考研阅读原文

Americans, she finds, buy roughly 20 billion garments a year-about 64 items per person一and no matter how much they give away, this excess leads to waste.

2013年考研真题（英语一）阅读理解 Section Ⅱ

But the Nobel Foundation's limit of three recipients per prize, each of whom must still be living, has long been outgrown by the collaborative nature of modern research—as will be demonstrated by the inevitable row over who is ignored when it comes to ack

2014年考研真题（英语一）阅读理解 Section Ⅱ

Reding invited corporations to sign up for gender balance goals of 40 per cent female board membership.

2013年考研真题（英语二）阅读理解 Section Ⅱ

That common- sense change enjoys wide public support and would save the USPS $2 billion per year.

2018年考研真题（英语一）阅读理解 Section Ⅱ

The Europe Union is now considering legislation to compel corporate boards to maintain a certain proportion of women—up to 60 per cent.

2013年考研真题（英语二）阅读理解 Section Ⅱ

These pauses typically occur at about three per second, and the eyes then jump to another spot, until several important points in the image are registered like a series of snapshots.

2020年考研真题（英语一）阅读理解 Section Ⅱ