这就防止废气倒流入进气管。
This prevents the intake charge from being blown out the exhaust.
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.
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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