It has experienced internal divisions and rising tensions in the past year, as major political parties struggle to agree on a basic political structure.

VOA: standard.2009.10.15

So, if you propagate that through the whole year, and you have the basic mastery of the concepts, 50 is a pass.

如果你一整年都在认真学，那你就可以掌握基本的概念,50分就可以通过。

麻省理工公开课 - 固态化学导论课程节选