draft system

• 通风系统

draft system的用法和样例：

例句

1. Something has gone wrong with the draft in the building.
   大楼的通风系统出问题了。
2. The crankcase ventilation system carries fresh air through the crankcase.
   曲轴箱通风系统要携带新鲜的空气通过曲轴箱。