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包围在心脏外面的肌肉墙，也就是心肌层，里面的电脉冲让心脏保持跳动。
Electrical impulses in the myocardium, the heart's muscular wall, keep your heart beating.
youdao
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包围在心脏外面的肌肉墙，也就是心肌层，里面的电脉冲让心脏保持跳动。
Electrical impulses in the myocardium, the heart's muscular wall, keep your heart beating.
youdao