The US has always been a remarkably mobile country, but new data from the Census Bureau indicate that mobility has reached its lowest level in recorded history.

美国一直是一个流动性很强的国家，但美国人口普查局的最新数据显示，美国的人口流动率已降至有记录以来的最低水平。

youdao

youdao

He's doing an A2 (level) in History.

他正在学习A2证书考试的历史科目。

《牛津词典》

He had taught college-level history for two years but had never been a college administrator.

FORBES: Unique selling proposition

Even with the decline, the Dow remains at its second-highest level in history, not counting inflation.

WSJ: Snap! There Goes Dow's Streak

In any case, if Treasury rates rise substantially from their present level, history strongly suggests that high yield bonds will be comparatively well cushioned.

FORBES: Are "High" Yield Bonds At Only 7% Worth The Risk?