under cover

基本解释

Sow them under cover anytime in the next two weeks and they'll both be in flower for early summer.
今后两周无论哪一天把这两种花籽洒在土里盖好，初夏时节就都开花了。
Gandhi the truth-teller died at the hands of his killers, some of whom, Jim Douglass alleges, walked away scot-free under cover of self-preserving lies.
甘地---这位真理的讲述着终于死在暗杀者的手里。道格拉斯宣称，一些暗杀者，在反对者的保护下平安的离开了。
On 16 and 17 September 1976, masked men raided their homes under cover of darkness, taking them away to clandestine detention centres in what became known as the "Night of the Pencils".
1976年9月16日和17日，一些蒙面男子在夜色下突袭了他们的住所，将他们带到了后来以“铅笔之夜”而闻名的秘密拘留中心。

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.
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.
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.

Under cover of operations in Afghanistan, America has beefed up its forces in the Gulf.
ECONOMIST: Saddam Hussein reopens talks on weapons inspection

Undercover work involves secretly obtaining information for the government or the police.
Undercover is also an adverb.