In mechanics, usually meet with confined motion of the body.
在力学中，经常遇到物体的约束运动。
The covariant equation of plane motion body in curved space-time is studied.
研究弯曲时空中平面运动刚体的动力学协变方程。
It is essential to put the entire body mass in motion behind long-range strikes.
把整个体重应用在远距离打击是必不可少的。
It is essential to put the entire body mass in motion behind long-range strikes.
把整个体重应用在远距离打击是必不可少的。
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