positive-negative pressure breathing
...oxygen-enriched aircrew breathing gas 释义：飞行人员富氧呼吸气 positive-negative pressure breathing 释义：正负压呼吸 tube for infant,corrugated breathing 释义：婴儿用橡皮螺纹呼吸管 ..
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短语
间歇性正负压呼吸
intermittent positive negative pressure breathing
正负压呼吸法
positive-negative pressure respiration
正负压呼吸器
positive-negative pressure respirator
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