Recent research has found that mice make humanlike facial expressions when they are in pain. Christie Nicholson reports.
最近的一项研究发现，当老鼠疼痛时，它们的面部会出现与人类相似的表情。
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Some patients experience tingling in the scalp or twitching of facial muscles. Others experience a headache, which can be relieved by any over-the-counter pain-relief medication.