expiration oxygen
过期的氧气
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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