...ocardium contraction(心肌收 缩), myocardium relaxation(心肌舒张), heart sound(心音), atrium systole (心房收缩期), atrioventricular valves(房室瓣),semilunar valves(半 月瓣),ventricular systole(心室收缩期), isovolumetric contractio...
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heart atrium systole 心房收缩
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