随着心室的收缩和舒张将血汞到了全身，心脏跳动一次，电波横穿心脏一次。
An electrical wave traverses the heart each time it beats, co-ordinating the contraction and relaxation of the chambers that pump blood around the body.
看见他的衬衫随着他的心脏的猛烈的跳动上下扯动着，这使她悦目。
She could see his shirt jerking with the hard beat of his heart, and it thrilled her.
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