Listen to entire inspiration and expiration at each stethoscope position.
每一听诊部位听诊均应呼、吸完整。
The process of respiration involves two major processes: inspiration and expiration.
呼吸的过程包含了两个主要的阶段：吸气和吐气。
Its character is that through the adjustable valve controlled by inspiration and expiration, it offers and halts oxygen supply. The utilization rate of oxygen is over 98%.
其主要特点是通过调控装置可使吸气时供氧，呼气时暂停供氧，故使氧的利用率高达98%以上。
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