熔体和气体前沿的速度和位移均急速上升。
The velocity and displacement of gas front and melt front increase dramatically.
对状态变量的观测，仅测量结构的前几个位移或速度。
The first few steps of displacements of the structure are measured.
因为位移有方向，所以速度也有方向。
Since displacement has direction, velocity also has direction.
因为位移有方向，所以速度也有方向。
Since displacement has direction, velocity also has direction.
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