It's not always easy, because the color on your face may tell the truth.

这并不总是件容易事，因为你的脸色可能会露出破绽。

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Keep smiles on your face, because life smiles to you.

脸上要保持微笑，因为生活向你微笑。

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"There shouldn't be light behind you, because it will darken your face," Rosenthal says.

罗森塔尔表示：“你的背后不应该有亮光，因为这会让你的脸色变暗。”

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Take care of this instrument, because your look,your face and everything you have - that is what you're constantly selling.

VOA: standard.2010.07.22

You want to avoid somebody like a Geraldine Ferraro, who's going to blow up in your face because you didn't vet her well enough, or Dan Quayle, who also wasn't vetted well enough.

NPR: Speculation Builds On McCain's, Obama's VP Picks

However, it is cutting off your nose to spite your face, because refusing to raise the debt ceiling would be consigning the economy potentially to another recession, certainly to reducing growth and job creation -- to the kinds of eventualities that would precisely -- would do the most damage to the cause of creating jobs and growing the economy.

WHITEHOUSE: Press Briefing

This sounds particularly worrying to me because your family and friends might be targeted with ads using your photos or face, without making it clear that Instagram is pushing the ads and not you.

FORBES: Instagram Can Now Put YOUR Face On THEIR Ads!