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to start to do or deal with something, especially in a determined or enthusiastic way
开始做某事，尤指以坚定或热情的方式
I have no idea how to set about changing a tyre on a car.
我不知道如何更换汽车轮胎。
I tried to apologize, but I think I set about it the wrong way.
我想道歉，但我觉得我一张嘴道歉就说错话了。