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。
2
The heart , which is a muscular pump , beats about 72 times a minute through a continuous and automatic process of muscular contraction and relaxation .