under the cover of…
在……的掩護(hù)下；以……為借口
例句：
The troop withdrew safely under the cover of darkness.
軍隊(duì)在夜幕的掩護(hù)下安全撤離了。
在……的掩護(hù)下；以……為借口
例句：
The troop withdrew safely under the cover of darkness.
軍隊(duì)在夜幕的掩護(hù)下安全撤離了。