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1·They move under cover of darkness.

他们在黑夜的掩护下行进。《柯林斯英汉双解大词典》

2·They managed to escape under cover of darkness.

他们设法在夜色掩护下逃跑了。《牛津词典》

3·Later, under cover of darkness, they crept into the house.

后来他们在夜幕的掩护下溜进了房子。《牛津词典》

4·Don't worry if it rain, because much of this is under cover.

下雨的话也不用担心，因为大部分都被遮住了。

5·A storm is coming. Let's get the wheat under cover quickly.

要变天啦，快把麦子收起来吧！《新英汉大辞典》

6·Skiers relax under cover in snow.

滑雪者在雪中休息。

7·Under cover of friendship they betrayed him.

打着友谊的幌子，他们出卖了他。

8·He kept the important information under cover.

他对重要的信息秘而不宣。

9·The attack jumped off under cover of a barrage.

进攻在炮火的掩护下开始了。

10·The check came under cover in yesterday's mail.

支票是装在信封里和昨天的邮件一起送来的。

(1)undercover agent卧底；警方密探