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。
In addition, sensation-seekers like new experiences that force them to push their personal limits.
此外,寻求刺激的人喜欢迫使自己突破个人极限的新体验。
Light's new trick is fancier than a boring push: It created the more complicated force called lift, evident when a flow in one direction moves an object perpendicularly.
但是光的新特性比单纯的推力要高级:光能产生这种更复杂的作用力-提拉力,很显著的例子是一个方向的光通量可以使物体垂直移动。
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