1.an exclusive circle of people with a common purpose.
一个有着共同目的的排外的圈子。
2.Method: Based on enrichment culture, blood plate separation, the flask culture and exclusive circle of methods such as oil.
方法：富集培养、血平板分离、摇瓶培养和排油圈测定。
3.An exclusive circle of friends
有限的几个朋友