fall down on

例句：

1. 1. The old man fell down on the floor when he got up too quickly.
   老人站起来太快时摔倒在地上。
2. 2.The team lost their balance and fell down on the field during the game.
   球队在比赛中失去了平衡，倒在了场上。
3. 3.The baby boy fell down on his knees and started to cry.
   婴儿男孩跪倒在地开始哭泣。