英美法系是判例法国家，采取遵循先例的原则。
There was almost no precedent to follow, no chart by which to steer.
有些法官通过不同的案例去尝试这一点，尽管中国还不是一个判例法国家。
Many judges are trying to do this via different cases, though China is not a nation that follows case law.
接下来通过对德国、法国、英美等国家的判例进一步分析，并研究、学习情事变更原则在上述国家的认定标准。
Thirdly focuses on cases in Germany, France, UK and us, analyzes the determining standards of POCC in these countries.
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