... reentry再进入 reference frame acceleration参考系加速度 reference frame velocity参考系速度 ...
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Mechanics Kinematics: trajectories, velocity, acceleration, motion of rigid bodies, change of reference frame.
力学运动：轨迹、速度、加速度、运动、刚体动力学变化的参考帧。
Some new concepts such as relative force, relative acceleration, relative reference frame, absolute force, absolute acceleration, and absolute reference frame was put forward.
提出了相对力、相对加速度、相对参照系和绝对力、绝对加速度、绝对参照系的新概念。
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