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1·He was a key figure in the campaign.

他是这场运动的关键人物。《牛津词典》

2·Cost was a key element in our decision.

价钱是我们决策时考虑的主要因素。《牛津词典》

3·Teamwork is a key feature of the training programme.

团队合作是这项训练计划的重要特点。《牛津词典》

4·I'll give you a key so that you can let yourself in.

我把钥匙给你，你可以自己开门进去。《牛津词典》

5·Enriched uranium is a key component of a nuclear weapon.

浓缩铀是核武器的一个关键组成部分。《柯林斯英汉双解大词典》

6·He will play a key background role in government policymaking.

他将会在政府决策中起至关重要的幕后作用。《柯林斯英汉双解大词典》

7·The former chairman was a key player in the deals that pushed the bank to the top.

该前主席是将那家银行推向顶峰的一系列协议的关键人物。《柯林斯英汉双解大词典》

8·He proved overconfident on the witness stand, misremembering a key piece of evidence.

他在证人席上显得过于自信，记错了一条关键证据。《柯林斯英汉双解大词典》

9·A key issue for higher education in the 1990s is the need for greater diversity of courses.

20世纪90年代高等教育的一个关键问题是需要使课程更加多样化。《柯林斯英汉双解大词典》

10·I couldn't find a key which fitted the lock.

我找不到适合这把锁的钥匙。