While there,he was asked to go with a special trade group from Korea to establish trade relations with the United States.

VOA: special.2010.07.11

so it's a 250-person class, but we have a group of 50 that we go around with quite a bit.

这是一门250人的课，但是我们组成50人一组一起学习。

跟校友们的关系 - SpeakingMax英语口语达人