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。

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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。

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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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During 2008 and 2009, IDF mounted Operation Cast Lead, which consisted of air strikes and a ground operation with the intention of eliminating the rocket launching capacity in Gaza.

FORBES: Israeli Ground Offensive Into Gaza 'Almost Assured' According To Stratfor

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

Israel launched an air and ground military assault on Gaza in December 2008 and January 2009 in an operation against Hamas.

CNN: Gaza music students find smart ways around travel ban