The purpose of the pneumatic system is to supply compressed air for a controlled temperature and pressure environment during all phases of flight and ground operation.

增压系统的作用是为飞行及地面所有阶段的温度和压力控制提供压缩空气。

youdao

This paper analyzed the energy consumption of a system in operation status——the double U-tubes vertically buried tube ground-source heat pump system in an air force station of Chongqing.

基于重庆市某空军场站的双U管竖埋式土壤源热泵系统工程，对该系统冬季变工况下的运行能耗进行了分析。

youdao

The game will simulate joint operation of ground, naval and air forces on vast areas.

这个游戏将在广阔的地区中模仿海陆空的联合作战。

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Targets selected by the United States since the air operation began Sunday have included air defense facilities, ground-to-air missile sites, and command and control facilities of Afghanistan's ruling Taliban and the al Qaeda terror network.

CNN: President notifies Congress about troop deployment

In 2003, in Operation Iraqi Freedom, five Navy carriers again provided essential air-superiority and ground support.

FORBES: Where are the Carriers?