rience 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！
e doing experiments, you must make careful observations. 做试验时，你必须仔细观察。
e 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。
had met her while doing a corporate job. 他是在一次合作项目中遇到她的。
likes to listen to music while doing his homework. 他喜欢一边做作业，一边听音乐。