您要查找的是不是：
- change off at doing sth. 轮流做某事
- Tom and Derek changed off at riding the bicycle. 汤姆和德里克轮流骑自行车。
- John and Bill changed off at riding the bicycle. 约翰和比尔轮换着骑这辆自行车。
- John and Bob changed off at driving the car. 约翰和鲍伯轮流开车。
- Be disappointed at doing sth. 对做某事感到失望。
- Take turns at doing sth. 轮流做某事。
- The marchers jumped off at the crack of dawn. 行军队伍在破晓时出发了。
- Start to work at sth.; Set about doing sth. 着手处理,开始做。
- It is time for the ringers to change off. 是敲钟人换班的时候了。
- The old man set off at a quick trot. 老人快步走开了。
- fag (away) at sth.[at doing sth.] 辛苦地做某事
- The taxi sped off at full speed. 那辆出租车飞快地开走了。
- Go beyond one's duty in doing sth. 超越职权范围做某事
- make an attempt at doing sth (to do sth) 试图做 ...
- I can drop you off at normandie ave. 我可以在诺曼蒂大街让您下车。
- The boy is good at doing a sum in his head. 这男孩善于心算。
- Have an opportunity for doing sth. 有[没有，很少有，有不多的]做某事的机会
- He always knocks off at six o'clock. 他总是在六点钟下班。
- I wanted off at the cross road, but was refused. 我想在十字路口下车可不准。
- You should always aim at doing your job well. 你永远应该以搞好你的工作为目的。
