选择服务会跟踪设计器表面上的组件选择。
The selection service tracks component selections on the designer surface.
地球表面的气压相对稳定，因此设计地面用的传音器，工程师并不需烦恼气压的大幅变化。
Air pressure on the surface of the Earth is fairly constant, so in designing a microphone for use on land, engineers don't have to worry about large variations in air pressure.
LRO太空飞行器在仅31英里的高度绕月球飞行，设计该飞行器的目的是绘制空前详细的月球表面地图，以帮助确定未来载人飞行任务可能的着陆点。
Orbiting the moon at an altitude of just 31 miles, the LRO spacecraft is designed to map the lunar surface in unprecedented detail to help identify possible landing sites for future manned missions.
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