Sometimes the cannon is fixed in position, and other times you have to use the force of firing it to push it into a spot where you can hit the ball.
有时大炮是固定的位置，其他时候你必须使用发射它的力量把它推到一个你可以击中球的点。
The prediction of the position of hit point of ping-pong and the velocity of the ball when reaching the hit point in the ping-pong robot project has been a research focus.
针对乒乓球机器人项目中乒乓球击打点位置及球到达击打点速度的预测问题进行探讨，分别建立了乒乓球飞行阶段的状态方程模型和乒乓球反弹过程的运动模型。
"The plane appears to have hit the surface of the water in flying position with a strong vertical acceleration," he noted, adding that the plane's belly hit the water first.
他指出：飞机看上去是在飞行方向上带着很强的垂直加速度撞到水面上，另外是机身的腹部首先撞到水面。
If we were to total the amounts of these projections and then actually hit those annual figures, we would be in a position to retire!
如果我们把这些预测数字加起来，然后就当成是年度销售额，那么我们只好退休了！
If we were to total the amounts of these projections and then actually hit those annual figures, we would be in a position to retire!
如果我们把这些预测数字加起来，然后就当成是年度销售额，那么我们只好退休了！
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