hit sb. when he's down

例句：

1. 1. He hit the ball with his bat.
   他用球棒击球。
2. 2. The car hit a tree and spun out of control.
   汽车撞上了一棵树，失控了。
3. 3. She hit the jackpot in the lottery.
   她在彩票中赢得了大奖。