团队发现，缺乏睡眠让人像僵尸一样用某种固定表情环顾四周。
Sleep deprivation made people look about as expressive, the team found, as a zombie.
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他的皱纹缺乏表情。
His wrinkles have no face.
由于缺乏表情，这句话说得可笑之极。
The lack of feeling in the thing was ridiculous.
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