随着人类渐渐长大，他的脸上也会出现哀伤痛苦的表情。
As human gradually grew up, his face will appear sad painful expression.
她哀伤的表情反映出了她因失去朋友而经受的巨大痛苦。
Her sad look reflected the great pain caused by loss of her friend.
最近的研究发现当老鼠痛苦的时候，它们也表现出痛苦的面部表情。
Recent research has found that mice make humanlike facial expressions when they are in pain.
最近的研究发现当老鼠痛苦的时候，它们也表现出痛苦的面部表情。
Recent research has found that mice make humanlike facial expressions when they are in pain.
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