Thank you for your answer.But ,I want to know the sister' group in fact.And in the USA, it also called "Greek Life". Anyway , thank you for your help.

I was in Greece several times (lived during months) and like this country with its people:))) Well, Greeks are very cheerful and kind nation. They like to work at the same time they can relax as noone other!:))) As for their disadvantages, they speak loudly and fast, sometimes it's quite difficult to understand them. Also they are too impulsive and ambitious, but if you attitude with respect to them and their culture they will respect you and do for you everything:))) Majority of them are christians and they are proud of their country very much. What else...the greek youth is such as european, girls with guys are very fashion, active, like night life in the clubs (I visited greek night clubs and never forget, really cool!)...so you can ask me what you want to know more about them:))))