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.
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.
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