球先前的位置指球被移动前的位置与移动后的现有位置不同应把球放回先前的位置
The previous position of the ball refers to the position of the ball before it was moved, which is different from the current position after the move. The ball should be placed back to its previous position
以上为机器翻译结果，长、整句建议使用 人工翻译 。