a、degree graduation certificate（PRC applicants have to submit the certificate of completion as well）
b、transcript in the sealed envelope from the university/institution
c、vocational/technical/trade certificates or diplomas
d、formal training certificates
e、。。。。。

我不太明白b项目指的是什么？成绩单还是其他？还有，certificate of completion是什么意思？本人英语实在是有点惭愧；-）哪位比较清楚，请帮忙解答，谢谢！