This is due natural air turbulence coming through the ventilation duct.

如扇叶遭逆风从排气管道进入吹袭,会产生此现象.

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Baotianman Wildlife Nature Reserve is not only the natural " air - raid shelter. "

宝天曼自然保护区不仅是野生动物的天然 “ 防空洞 ”.

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Some growers like natural air - drying.

一些种植主喜欢自然风干.

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In natural air of the troposphere a suitable amount of ozone is beneficial to clean air.

在对流层大气中,适量臭氧对清洁大气是有益的.

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Autumn picking cotton last year after much cotton was down in the gate, the natural air - dry.

去年棉花秋天摘完后,许多棉花栅被撂在地里, 自然风干.

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