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当鲸鱼潜水时，它的新陈代谢率下降，导致心跳减慢。
When a whale dives, its metabolic rate drops, causing its heartbeat to slow down.
youdao
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当它潜水时，它的心跳速度就能减慢到正常心跳的一半。
When it dives, its heart slows to half its normal speed.
youdao
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当它潜水时，它的心跳速度就能减慢到正常心跳的一半。
When it dives, its heart slows to half its normal speed.
youdao