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》

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》

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》

Critics,including the Australian government, say the research argument is a cover for the sale and consumption of whale meat, which is banned under international regulations.

VOA: standard.2010.01.06

Critics,including the Australian and New Zealand governments, say such arguments are a cover for the sale and consumption of whale meat, which is banned under an international moratorium on commercial hunting.

VOA: standard.2010.01.05

The speaker of Iran's parliament, All this iusses indicate the fact that the US president is pursuing the arrogant and dominating approach of the past but under the cover of public-deceiving gestures.

VOA: standard.2010.04.11

Under cover of operations in Afghanistan, America has beefed up its forces in the Gulf.

ECONOMIST: Saddam Hussein reopens talks on weapons inspection

What, then, to make of its sudden removal last week under cover of dark?

ECONOMIST: In the night an old philosopher mysteriously vanishes

Under cover of darkness, this small elite unit launched an airborne assault deep into insurgent-held territory.

BBC: UK troops launch Operation Tor Shezada in Afghanistan