Well, before, the speed is zero and so the momentum is zero. And there comes the bang and one piece flies in this direction with a certain velocity, v2 prime.
在之前，速度为，动量也为0，现在砰响了一声，一片朝这个方向飞，它的速度为v2。
And another piece flies off in this direction with mass m1, with velocity v1 prime.
另一片往这个方向飞，质量为m1，速度为v1。
And we're going to have q2 prime, and we're going to draw the arrows in the positive direction in these cases.
还有q 2一撇，在这个例子中，我们把箭头朝正方向。
More and more of the Prime Minister's colleagues were thinking that the time had come to alter direction.
首相周围越来越多的同僚以为应该转变方向了。
The prime overall thing is that you move toward happiness in the direction of where it really is, in you, not in the externals.
首要的是你要朝着幸福真正所在的方向，就是在你之内，而不是在外面。
More and more of the prime minister's colleagues were thinking that the time had come to alter direction .
首相周围越来越多的同僚以为应该转变方向了。
The prime motor rotates in a fixed direction and the alternating motion of the carrier bar is accomplished by the crank-rocker mechanism.
电动机单向旋转，用曲柄摇杆机构换向，实现悬点的往复直线运动。
The prime motor rotates in a fixed direction and the alternating motion of the carrier bar is accomplished by the crank-rocker mechanism.
电动机单向旋转，用曲柄摇杆机构换向，实现悬点的往复直线运动。
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