1. The maximum stress of the framework occurred at the node of undersurface of the main hydraulic cylinder mounting boss. 机架最大应力值发生在主油缸安装凸台下表面的节点上。
2. He imagined the ship dangling upside down on the undersurface of the Earth, the giant fingers of gravity holding them firmly in place. 他想象着飞船吊在地球下面上下晃荡，巨大的引力手指把他们紧紧地抓在这个地方。
3. The principal advantages of wave riders are the high lift-to-drag ratio at the design point and the uniform flow field on the undersurface. 乘波构形的特点是高升阻比，下表面上的流动是均匀的，因此是推进系统/机身一体化设计的理想候选构形。
