他的腿在睡觉时突然抽动了一下。

His leg had a sudden twitch while he was sleeping.

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His leg had a sudden twitch while he was sleeping.

twitch 是动词,意思是"抽动、抽搐",指肌肉或身体部位突然、不自主地快速收缩一下。在句中作名词用,表示"抽动的动作"。

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