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备战考研英语，大众考生的第一反应便是从英语词汇入手。努力的开始一定要牢固基础。考研英语基础层级一定是英语词汇，一定要努力拿下英语词汇！

1.relative to  相对于；和...相应，和...有关

音标 [ˈrelətɪv tu]

例句

The satellite remains in one spot relative to the earth's surface.

相对地球表面而言，这颗卫星位置固定。

House prices now look cheap relative to earnings

相对收入而言房价现在看起来比较便宜。

2.at this rate  照此速度

音标 [æt ðɪs reɪt]

例句

At this rate, she would be almost seven feet tall by then.

这样下去，她到时将有7英尺高了。

At this rate they'd be lucky to get home before eight-thirty or nine.

这样看来他们能在8点半或是9点以前到家就算幸运了。

3.doubtful about/of  对...怀疑

音标 [ˈdaʊtfl əˈbaʊt]

例句

I was still very doubtful about the chances for success.

我对能否成功仍然深表怀疑。

I feel doubtful about his ability to do the work.

我怀疑他有无做这件事的能力。

4.at the mercy of  任凭...摆布

音标 [æt ðə ˈmɜːsi ɒv]

例句

Ordinary people are at the mercy of faceless bureaucrats.

普通人的命运任凭那些平庸刻板的官僚们摆布。

And I was in fetters, at the mercy of the mob.

我身着枷锁，任暴徒摆布。

5.at the cost of  以...为代价

音标 [æt ðə kɒst ɒv]

例句

The lessons learned at the cost of blood helped to sober us.

血的教训使我们的头脑清醒了。

Success may come at the cost of your relationship with your family.

成功的代价可能是你和你家庭的关系。