... under plain cover 以普通信封寄发 under cover 隐藏着 break cover 从隐藏处出来 ...
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send under plain cover 用不注明发信人姓名的封皮寄发
Pioneering camera technology has allowed photographer Martin Dohrn to film animal life on the African plain at night, under cover of complete darkness.
在无边黑夜的掩护下，借助先进成像科技才使得摄影师马丁·多恩得以用影像记录非洲大草原夜晚的动物生活。
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