plateau是什么意思

As some countries expand operations in Antarctica, the United States maintains three year-round stations on the continent with more than 1,000 people during the southern hemisphere's summer, including those at the Amundsen-Scott station, built in 1956 at an elevation of 9,301 feet on a plateau at the South Pole.

出自-2016年12月阅读原文

As some countries expand operations in Antarctica, the United States maintains three year-round stations on the continent with more than 1,000 people during the southern hemisphere's summer, including those at the Amundsen-Scott station, built in 1956 at

2016年12月六级真题（第三套）阅读 Section B

Workers tended to be diligent for the first few days of the week in any case, before hitting a plateau and then slackening off.

2010年考研真题（英语一）完形填空 Section Ⅰ