Velocity: the speed and direction of an object, or its rate of change in position.
速度：一个物体运动的方向和速率。或者是在某一位置的变速率。
Maximum rate of change of left knee, is a proactive force to bring the body to throw the direction of lower limb rotation.
左膝关节速度变化最大，是积极主动用力来带动身体下肢向投掷方向转动。
The results show that the axis linear ablation rate of the material has a great change and the linear ablation increases along the gas flux direction.
结果表明：导流管轴向线烧蚀率变化较大，沿气流方向呈上升趋势。
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