Contingent fee system originated from U. S. A. It's currently the more popular legal charging method internationally.

起源于美国，是目前国际间较为流行之律师收费制度。

According to a teacher at a local high school, a middle school diploma is contingent on sitting for the high school entrance exam, which carries a 650-yuan fee.

一名当地中学教师告诉记者，要取得初中毕业证书就必须参加中考，考试费用是650元。