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。

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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。

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Trolls capture economies of scale in litigation, and lower their committed capital by using contingent fee lawyers.

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Some question whether these restrictions on contingent fee work are fair or legal.

FORBES: Can Lawyers or Accountants Do Your Taxes on Contingency?

Tax practitioners may charge a contingent fee for services rendered in connection with any judicial proceeding arising under the Internal Revenue Code.

FORBES: Can Lawyers or Accountants Do Your Taxes on Contingency?