1.upper airway 上呼吸道
例句:In obstructie sleep apnea, the upper airway narrows, or collapses, during sleep.
在阻塞性睡眠呼吸暂停中, 睡眠期间上呼吸道狭窄或踏陷.
2.be designed to 制定
例句:This project is designed to help landless people.
这一项目旨在帮助那些没有土地的人
。3.call for 要求
例句:They angrily called for Robinson's resignation.
他们愤怒地要求鲁宾逊辞职
。4.free from 摆脱了…的
例句:The filtration system provides the crew with clean air free from fumes.
过滤系统使得全体人员能够呼吸到没有烟雾的清新空气
。