These are nothing more than wide places in the exhaust flue where larger particles can settle out of the exhaust gas stream.
仅仅是排气通道中的一些宽阔区域，较大的微粒会在其中沉积，这样排出的气体中就只有较小微粒了。
The control of gases involves the removal of the pollutant from the exhaust gas stream, a chemical change in the pollutant, or a change in the process producing the pollutant.
气体的控制包括：从排气流中除取污染物，使污染物产生化学反应，或改变产生污染物的流程。
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