Well, it turns out that we could not identify, at least at that point, a cell culture that would serve as a host for vaccinia.

然而我们还不能断定,至少这个时候无法断定,这些被感染的细胞就是牛痘病毒的宿主

耶鲁公开课 - 生物医学工程探索课程节选

I'm more than happy to serve this country, go and help out what's happening in...

我很高兴我可以为祖国服务，为国出力。

英国的军人 - SpeakingMax英语口语达人