Some hide behind the mask of performance.

有些人躲在“表现”这个面具后。

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Behind the mask of friendliness, I know he really dislikes me.

在友善的面具后面，我知道他其实并不喜欢我。

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To be "Machiavellian" came to mean to be a sly schemer, one who hides his evil intentions behind the mask of executive necessity.

“如同马基维利”意味将邪恶的意图隐藏在合理面具下的狡猾阴谋家。

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Thanks to a few pesky Internet lawyers, people who make nasty comments on the web may soon find it harder to hide behind the mask of anonymity.

FORBES: Lawsuits Against Web Trolls?Are On The Rise

But Crystal and his co-writers (Lowell Ganz and Babaloo Mandel) aim to get behind the ironic mask of this Yiddish harlequin and reveal the fierce ambition and bitterness that fuel his put-downs.

NEWYORKER: Mr. Saturday Night

He puts out his own audio tapes over the Internet, in the style of bin Laden, and most chillingly he claimed to be the man behind the mask executing American Nicholas Berg.

CNN: The world's most dangerous terrorist