On the basis of analysis of thermal insulating flow for high pressure air, the quantitative mathematical model for closed air test was built.

根据对高压气体绝热流动规律的分析，建立了闭气试验定量数学模型。

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Decades of working over coal fires in tight, closed spaces with little fresh air (to ensure his dishes would not get cold) had fatally damaged his lungs.

几十年来，为了不让菜变凉，他在狭小、封闭的空间里用煤生火，里面几乎没有新鲜空气，这对他的肺造成了致命的伤害。

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With the help of Air Classroom, students can keep learning even with schools closed.

在空中课堂的帮助下，即使学校关闭，学生也可以继续学习。

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Israel closed its air space to foreign planes, closed land crossings and evacuated staff from diplomatic missions and Jewish institutions around the world.

CNN: Attacks spark global red alert

Keep the windows closed and the air-conditioning on, giving you an allergen free bubble.

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Officials and manufacturers also claim that new scrubbing technologies mean modern incinerators emit far fewer noxious nasties than their older counterparts, many of which have been closed down as air-quality rules have been tightened.

ECONOMIST: Tough landfill targets prompt a return to flaming rubbish