对于其支持者来说，在发电厂的废气排放管道上种植单细胞藻类是再循环的根本途径。
FOR its supporters, the idea of growing single-celled algae on exhaust gas piped from power stations is the ultimate in recycling.
他拿起一个榔头，在右侧挡泥板前弯下身，轻轻敲了两下废气循环阀。
He picked up a ball-peen hammer, leaned on the passenger-side fender, and tapped twice on the EGR valve.
EGR系统的关键就是控制废气的引入量，使废气的再循环量在每一个工作点都达到最佳状况。
The key to an EGR system is introduced, and the control of exhaust gas quantity recirculation quantity of that in every point at best.
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