They move under cover of darkness.

他们在黑夜的掩护下行进。

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。

They managed to escape under cover of darkness.

他们设法在夜色掩护下逃跑了。

I woke under cover of darkness.

我在黑暗之中醒来。

They acted under cover of the police.

他们在警方的掩护下采取了行动。