mechanical heart

例句：

1. 1.The mechanical heart is a device that pumps blood through the body.
   机械心脏是一种通过身体泵血的设备。
2. 2. The patient's mechanical heart was not functioning properly.
   患者的机械心脏功能不正常。
3. 3. The doctor performed an operation to replace the patient's mechanical heart.
   医生进行了手术，替换了患者机械心脏。