while doing sth的意思是“当做某事的时候”，它是whle sb is/was doing sth的省略形式，这种省略原则上要求主句与从句的主语一致。如：He fell asleep while (he was) doing his homework.他做着做着功课就睡着了。
1.Experience is not have done, it is what you have learned while doing it! 经验不是你曾经做过什么，而是你在做的过程中学到了什么！
2.While doing experiments, you must make careful observations. 做试验时，你必须仔细观察。
3.While doing the business she is having two young children to care for. 她边做生意边照料两个年幼的孩子。
4.He had met her while doing a corporate job. 他是在一次合作项目中遇到她的。
5.He likes to listen to music while doing his homework. 他喜欢一边做作业，一边听音乐。
