The heart is a muscular pump at the center of the cardiovascular (circulatory) system.
心脏位于心血管(血液循环)系统的中枢，相当于一个由肌肉组织构成的泵。
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。
For instance, the goal in climbing is to avoid muscular failure at all costs and, hopefully, reach the top of a boulder problem or climb before the arm and forearm muscles pump out.
举例说吧，攀爬的目的是想方设法避免肌肉力竭，在手臂和前臂肌肉力竭前有希望到达顶点。
For instance, the goal in climbing is to avoid muscular failure at all costs and, hopefully, reach the top of a boulder problem or climb before the arm and forearm muscles pump out.
举例说吧，攀爬的目的是想方设法避免肌肉力竭，在手臂和前臂肌肉力竭前有希望到达顶点。
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