高考Thus humans who lived a million years ago, despite their big brains and sharp stone tools, lived in constant fear of meat-eating animals.

因此，生活在一百万年前的人类，尽管他们有着巨大的大脑和锋利的石器，却一直生活在对肉食动物的恐惧之中。

考研You may have a circle of friends who provide constant good humor, help and companionship.

你可能有一个朋友圈，他们提供持续的良好幽默感、帮助和陪伴。

考研Vanity is a constant; people will only start shopping more sustainably when they can’t afford not to.

虚荣是永恒的；人们只有在买不起东西的时候才会开始更可持续地购物。

高考For busy librarians and educators, finding instructions for projects, activities, sports, and games that children and teens will find interesting is a constant challenge, this guide is a time-saving, one-stop....

对于忙碌的图书馆员和教育工作者来说，为儿童和青少年感兴趣的项目、活动、体育和游戏寻找指导是一个持续的挑战，本指南是一个节省时间的一站式指南。。。。

六级By running constant deficits, it is dis-saving, even as households save more.

即使家庭储蓄更多，持续赤字也会导致储蓄减少。

高考He has a constant urge to check for text messages; he checks his phone every five minutes! He's so addicted to it that he just can't stand the idea that there may be an important text.

他有一种不断检查短信的冲动；他每五分钟检查一次手机！他如此沉迷于它，以至于他无法忍受可能有一篇重要的文章。

高考Symptoms of it include a headache that is constant but not severe, and a pain at the back of your head and the neck.

它的症状包括持续但不严重的头痛，以及后脑勺和颈部疼痛。

四级Some desalination plants exist where feasible, but they are costly to run and can need constant repairs.

一些海水淡化厂在可行的情况下存在，但运行成本高，需要经常维修。

考研There's always a constant fear of falling behind everyone else on the socially perpetuated "race to the finish line," whether that be toward graduate school, medical school or a lucrative career.

无论是在研究生院、医学院还是赚钱的职业生涯中，人们总是担心在社会长期存在的“终点线赛跑”中落后于其他人。

四级Indoor pollution, which includes sources like home heating and cooking, has remained constant over the past several decades despite advances in the area.

室内污染，包括家庭取暖和烹饪等污染源，尽管在这方面取得了进展，但在过去几十年中一直保持不变。

六级Constant complaints from passengers.

乘客不断的抱怨。

六级At heights of over 18000 feet, people may be climbing in a constant daze（恍惚）.

在超过18000英尺的高度上，人们可能会在持续的眩晕中攀爬(恍惚）.

六级Are people suffering from gadget overload? Are they exhausted by the consumer equivalent of the brain fatigue—information overload—that is caused by constant updates of devices and online media?As you are probably aware, the latest job markets news isn’t good: Unemployment is still more than 9 percent, and new job growth has fallen close to zero.

人们是否正遭受着电子设备过载的痛苦？他们是否因消费者的大脑疲劳而精疲力竭，这相当于设备和在线媒体的不断更新所导致的信息过载？正如你可能知道的，最新的就业市场消息并不好：失业率仍然超过9%，新的就业增长率已经接近于零。

考研It needs constant guardianship.

它需要不断的监护。

六级No one should have to live with what a Texas mother described as constant stress, tension, even fear about money.

任何人都不应该生活在德克萨斯州一位母亲所说的持续的压力、紧张甚至对金钱的恐惧之中。

高考From the very beginning of school, we make books and reading a constant source of possible failure and public humiliation.

从学校一开始，我们就让书籍和阅读成为可能失败和公开羞辱的持续来源。

高考They believe, for example, that their employees need constant supervision if they are to work effectively, or that decisions must be imposed from above without consultation.

例如，他们认为，他们的员工要想有效工作，就需要不断的监督，或者必须在没有协商的情况下从上级做出决定。

四级The result of constant muscle tension and stiffness of joints, many of them are avoidable, and simple flexibility training can prevent these by making muscles stronger and keeping joints lubricated (润滑 ).

肌肉持续紧张和关节僵硬的结果，其中许多是可以避免的，简单的柔韧性训练可以通过使肌肉更强壮和保持关节润滑来防止这些(润滑 ).

四级People do it at the expense of everything that was a constant in their lives.

人们这样做是以牺牲生活中的一切为代价的。

高考Second, if other factors such as technology remain constant, economic growth and material expectations will fall well below recent standards and this could invite trouble.

其次，如果技术等其他因素保持不变，经济增长和物质预期将远低于近期标准，这可能会带来麻烦。

考研Constant health scares just end up with no one listening.

持续的健康恐慌最终导致无人倾听。

六级As constant travelers and parents of a 2-year-old, we sometimes fantasize about how much work we can do when one of us gets on a plane, undistracted by phones, friends, or movies.

作为一个2岁孩子的常客和父母，我们有时会幻想当我们中的一个人坐上飞机时，我们能做多少工作，而不被电话、朋友或电影所打扰。

四级In some cases, schools should help children find new, more grown-up ways of doing the same things that are constant sources of joy: making art, making friends, making decisions.

在某些情况下，学校应该帮助孩子们找到新的、更成熟的方式来做同样的事情，这也是快乐的源泉：做艺术，交朋友，做决定。

六级By 1973, domestic US sources of oil were peaking, and the nation was importing more of its oil, depending on a constant flow from abroad to keep cars on the road and machines running.

到1973年，美国国内的石油来源达到顶峰，美国进口了更多的石油，这取决于来自国外的源源不断的石油流，以保持汽车在公路上行驶和机器运转。

考研Vanity is a constant; people will only start shopping more sustainability when they can't afford not to.

虚荣是永恒的；人们只有在负担不起的时候才会开始更可持续地购物。