The veil she was wearing obscured her features.

她戴面纱遮掩了她面容。

We reached a beautiful grotto, whose entrance was almost hiden by the vine.

我了一个美丽洞穴,洞进口几乎被藤蔓遮掩著。

Heavy clouds overshadowed the mountain.

厚厚云层遮掩了大山。

A smile masked his disappointment.

微笑遮掩了他失望。

His defense, which seems credible on the evidence so far, is that the bank masked its skullduggery so completely that no regulator anywhere in the world could get a handle on it.

他辩词(根据目前证据似乎可信)是：银行把它偷天换日做法遮掩得天衣无逢，全世界任何地方员都无法掌握。