President Obama says Americans have a responsibility to serve their fighting men and women as well as they serve their country.

VOA: standard.2009.05.23

Well, if you knew a cell that could serve as a host for a virus, you could use this process of cell culture to make large quantities of virus,right?

如果你知道细胞可以变成病毒的宿主,可以用培养细胞的过程,制造大量病毒,对吧

耶鲁公开课 - 生物医学工程探索课程节选

A lot of it is based upon how well you can serve clients, you know, how well you can talk with clients,

这很大程度上取决于你对客户服务得多好，你和客户交流得多好，

会计学很有意思 - SpeakingMax英语口语达人