appearance和look都表示“外观，外表”，但这两个名词使用上有所不同。

1.appearance的意思是“外貌，外观，外表”，它是普通用语，不带任何色彩，指对人和事物的外表进行客观的陈述，但有时也指虚假的外表。比如：

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Don't be fooled by his appearance.不要被他的外表所蒙蔽。She had always prided herself on her appearance.她总是对自己的外貌感到得意。Young people are very sensitive about their appearance.年轻人对自己的外貌很敏感。

She had never been greatly concerned about her appearance.她从来不怎么注重外貌。My appearance looked foreign.我的外表看起来像外国人。She would joke about her appearance.她会拿她的长相开玩笑。

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She became neglectful of her appearance.她变得不修边幅起来。He took in every detail of her appearance.他仔仔细细打量了她一番。

2.look的意思是“脸色，外表，神态，外貌”，是普通用语，多用复数，经常跟appearance交换使用，但是口语中用得更多一些。当强调人的外貌，具体细节如颜色、形状、表情、神态、举止的时候，多用look。比如：

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Looks can be deceptive.外表有时是靠不住的。I don't like the look of that guy (= I don't trust him, judging by his appearance) .看他那副样子，我不喜欢。He didn't like the look in her eyes.他不喜欢她的眼神。

She had a worried look on her face.她一脸担忧的样子。She had the look of someone deserted and betrayed.她露出被抛弃、被背叛的人的神情。

I never chose people just because of their looks.我从不单凭外貌取人。She has her father's good looks .她有父亲俊秀的容貌。He lost his looks (= became less attractive) in later life.他英俊的相貌在晚年已不复存在。