表达的英语：expression；
例句：
Her expression was watchful and alert.
她露出一副察言观色、处处提防的表情。
Her expression showed her disappointment.
从她的表情可以看出她很失望。
The expression on his face never changed.
他的面部表情总是一成不变。
There was a bored expression on her face.
她脸上有一种厌倦的表情。
His expression changed from amazement to joy.
他的表情由惊变喜。
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