这就防止废气倒流入进气管。

This prevents the intake charge from being blown out the exhaust.

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黏液还有助于防止肺部被灰尘、细菌、香烟的烟雾、废气和其它入侵者感染。

Mucus also helps protect your lungs from dust, bacteria, cigarette smoke, exhaust fumes and other intruders.

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由NRF2基因表达的产物通常通过吸收和泵出细胞的方式，防止香烟及柴油废气等环境污染物对细胞的损害。

Products made by a gene called NRF2 normally protect cells from environmental pollutants like cigarette smoke and diesel exhaust by absorbing the materials and pumping them out of the cell.

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例如，汽车应该配备一个设备可以处理废气，以防止污染空气。

For example, the automobiles should be equipped with a device which can dispose of waste gas so as to prevent it from polluting air.

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例如，汽车应该配备一个设备可以处理废气，以防止污染空气。

For example, the automobiles should be equipped with a device which can dispose of waste gas so as to prevent it from polluting air.

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