They left under the cloak of darkness.
他们在黑暗的掩护下离开了。
《牛津高阶英汉双解词典》
They did it under the cloak of darkness.
他们是趁着黑夜干的.
辞典例句
He was hidden under the cloak of darkness.
他在夜幕的掩护下隐蔽着.
互联网
Acting under the cloak of charity, he made afor himself from the gifts of charitable people.
他打着办慈善事业的幌子, 用慈善家们的捐献中饱私囊.
互联网