To these is the premise of the subway to have good air conditioning and ventilation system.

要实现这些的前提是地铁要有良好的空调通风系统。

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De sign of the purification of air conditioning and ventilation system in the transformer factory was introduced.

介绍了该互感器厂净化空调及通风系统的设计。

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The supply of fresh air in the existing air conditioning and ventilation system directly affects the working environment.

现有建筑物中央空调通风系统的新风供应情况，直接关系到人们的生活工作环境。

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Rupert said the same chlorine dioxide treatment will be used on the building's heating, ventilation and air conditioning system (HVAC), where spores had been found after the letter was opened in Daschle's office.

CNN: Fumigation largely succeeding in clearing anthrax