所有现代制造的汽车发动机，都需要装备控制曲轴箱有害污染的曲轴箱强制通风系统。
All automobile engines now built are equipped with the positive-crankcase ventilation system of crankcase emission control.
在强制热风和冷风系统中，通风管道将热空气的冷空气输送到家里不同的地方。
In forced-air heating and cooling systems, ducts carry hot or cold air to different parts of home.
通风控制是强制通风静态好氧堆肥系统的技术关键。
Aeration control is the key to the aerated static aerobic composting system (ASACS).
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