When the heart beats, an electrical signal passes from the top of the heart, near the atria (upper chambers), down through the ventricles (lower chambers), and the chambers contract in that order.

当心脏跳动时，一个电子信号就会从心脏的顶部传到一个心腔（位于上部），然后是位于下部的心腔，当它收缩时，也是按照这样的顺序。

youdao

He needed to bask himself in that smile, he said, in order that the chill of so many lonely hours among his books might be taken off the scholar's heart.

他那时常说，他需要在她的微笑中温暖自己，以便从他那学者的心中驱散长时间埋头书卷所积郁的寒气。

youdao

After the Grinch has a change of heart and tries to keep the sled from plunging off a clip, his heart must grow three sizes in order to save it. We may not all be that lucky.

但是他的雪橇不能装下所有的东西，为了控制雪橇不至于跌落悬崖，他的心脏必须增大至之前的三倍。在这个时候不是每个人都那么幸运啊。

youdao

It was not used after the Revolutionary War, however, until it was revived in 1932, after Washington's order establishing the award was discovered among his papers, according to the Web site of the Military Order of the Purple Heart.

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Zang says he invented the device in order to facilitate the treatment of patients with heart disease across Cameroon and the rest of Africa.

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