Based on the CAD mathematics mode of the front body floor of vehicle a, the structure is simplified, and the dynamics performance is analyzed.
在A车前底板CAD数学模型的基础上，对结构进行简化处理，分析了该结构的动力学性能。
Keep your head and body vertical, and your feet firmly on the floor in front of you so your knees bend over your toes.
保持头部和上身竖直，你的双足平稳地放在你前方，从而让你的膝部弯过你的脚趾。
Above me is a sky of stone and, beneath me, is a ground of smooth, human-set rock. The large square room in front of me is empty, the cold floor of cement remaining unbroken. Except for the body.
在我的头顶上是石头筑成的天，在我的身边是光滑的人造的石头的壁，在我面前的巨大的方形的房间是空荡荡的，冰冷的水泥地是牢不可破的，只有一具尸体。
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