Slowly she threaded her way back through the moving mass of bodies.
她在行人中缓慢穿行,挤了回来。
You're not moving, you're in the center of mass.
你没有移动,你处于质量重心。
A cold front is the forward edge of a mass of moving cold air.
冷锋是一团移动着的冷气流的前锋面。
The force moving a body is proportional to the mass of the body.
移动一个物体的力与该物体的质量成正比。
The force moving a body is proportional to the mass of the body.
移动物体的力与该物体的质量成正比。
A mass of cold air is moving south.
大团冷空气正在南移。
Pretty soon the sky is filled with a mass of moving dots.
不久天边充满了细密浮动的黑点。
Pretty soon the sky is filled with a mass of moving dots.
不久天边充满了细密浮动的黑点。
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