1·Everything is loose in the house, and poor grandmother told me she was afraid that the house might tumble down.
房子里所有地方都松动了,可怜的奶奶告诉我她担心房子会倒塌。
2·That old building could tumble down at any time.
那座古老的楼房随时可能倒塌。
3·They always like on the bed to jump up to jump down, so parents' wanting to insure a bed is firm, do not tumble down of danger;
他们总是喜欢在床上跳上跳下,所以父母要确保床是稳固的,没有倒塌的危险;