血液的吸入是单向的，吸入后不会再由食管吐出来。
The inhalation of blood is one-way, not after inhaling out to the esophagus.
活塞向一个方向移动时，环路中低压端的气态制冷剂通过一个单向阀，循环中低压端的气态制冷剂被吸入进来。
As the piston travels in one direction, through a one way valve, it draws in the refrigerant gas from the low pressure side of the circuit.
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