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- To fall down or inward suddenly;cave in. 倒塌突然倒下或塌陷；塌陷
- To fall down or inward suddenly; cave in. 倒塌:突然倒下或塌陷;塌陷。
- He fall down the stairs, landing in a heap at the bottom. 他从楼梯上摔下来，直跌到楼梯底部滚成一团。
- They went to the cave in quest of hidden treasure. 他们到山洞去寻找宝藏。
- The enemy had to cave in and surrender. 敌人只好屈服投降。
- You must watch your step so as not to fall down. 你必须留心脚下才不会跌下去。
- I should fall down and die in the woods. 我宁可倒下来死在森林里了。
- The roof is dangerous and could cave in at any time. 屋顶很危险，任何时候都会坍塌。
- I heard someone fall down the stairway. 我听到有人摔下楼梯。
- The climber fell down a cleft in the rocks. 爬山者跌入岩石的裂缝里。
- The beggar fell down in a swoon from sheer hunger. 那个穷人饿得晕倒了。
- The house might fall down in a few months. 几个月内这所房屋也许会倒塌。
- In autumn the leaves fall down from the trees. 秋天树叶从树上掉下来。
- Don't climb on that old roof. It might cave in. 别爬到那个旧屋顶上，它会塌的。
- They had at last to cave in and surrender. 他们最后不得不屈服投降。
- He fell down the stairs and was all black and blue. 他从楼梯跌下而青一块紫一块了。
- The roof of the old house will cave in any time. 这所老房子的屋顶随时会塌下来。
- The old woman fell down a flight of stairs. 那位老太太从一段楼梯上摔了下来。
- The earthquake made the roadbed cave in. 地震后路基沉陷了。
- The toddler tried to walk but kept falling down. 那小孩学著走路但老是跌跤。
