What's the requirement for the forced ventilation system for crankcase? 發動機曲軸箱強制通風的要求？
All automobile engines now built are equipped with the positive-crankcase ventilation system of crankcase emission control. 所有現代製造的汽車發動機，都需要裝備控制曲軸箱有害污染的曲軸箱強制通風系統。
Forced air systems send heated air through ductwork. 機械通風通過管道系統來輸送熱空氣。
The building uses a mixed system of mechanical and natural ventilation, a high performance glass facade and other environmentally sustainable systems, such as sea water cooling. 建築使用了機械通風與自然通風相結合的混合通風系統，高性能的玻璃立面，以及其他可持續系統如海水冷卻系統。
