随着越来越多的汽车被制造和使用，这些汽车排气管里的排放物所包含的有毒气体的总量也越来越多。
As more and more cars are produced and used, so the emission from their exhaust-pipes contains an ever larger volume of poisonous gas.
系统工作原理是：DPF过滤柴油机排气中的颗粒物（PM），从而使排放达到相应的标准。
The working principle of the system is: DPF filters the particulate matter (PM) in diesel engine exhaust, to make emission up to certain standard.
约10％-30％的燃烧产物会以颗粒物状态随尾气排放到大气中，而其余大部分则沉积到发动机、排气系统及催化转化器的表面。
Only about 10%-30% products will be emitted as PM into atmosphere through tailpipe, but most parts will deposit on surface of engine, exhaust system and catalytic converter.
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