医生到达时,他的心脏已经停止了跳动。

医生到达时,他的心脏已经停止了跳动。

By the time the doctor had arrived, his heart had stopped beating.

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By the time the doctor had arrived, his heart had stopped beating.

beating 是动词 beat 的 -ing 形式,beat 的基本意思是"跳动、敲打",这里指心脏有规律的跳动。 在句中,stop 后面接 beating 表示"停止做某事",说明心脏跳动的动作已经终止。

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