v.倒塌( tumble的第三人称单数 );翻滚;突然摔倒;<非正>恍然大悟;
例句:
They took a number of tumbles after a few minutes'rest.
休息几分钟后他们又翻了几个筋斗.
The two brothers tumbles for the new bicycle.
兄弟俩都非常喜欢这辆新自行车.
He wears a tin can on his biscuit in case he tumbles.
他头上戴着头盔,以防跌下来摔伤.