The heart, which is a muscular pump, beats about 72 times a minute through a continuous and automatic process of muscular contraction and relaxation.
心脏为一肌肉泵，它通过心肌收缩和舒张这一边疆不断的自动过程每分钟大约搏动72下。
The heart , which is a muscular pump , beats about 72 times a minute through a continuous and automatic process of muscular contraction and relaxation .
心脏是一个肌肉构成的泵。它通过心肌的收缩和舒张这一连续不断的自动过程每分钟大约搏动72次。
The heart , which is a muscular pump , beats about 72 times a minute through a continuous and automatic process of muscular contraction and relaxation .
心脏是一个肌肉构成的泵。它通过心肌的收缩和舒张这一连续不断的自动过程每分钟大约搏动72次。
应用推荐