Because we do try to give as much partial credit as possible in these exams, since there are a lot of places where small mistakes can result in the wrong answer.

因为我们会尽量把能给你的步骤分都给你,在对于这种考试时，因为有很多地方,只要出一点小问题就会导致最后结果出错。

麻省理工公开课 - 化学原理课程节选

We can't give you any partial credit whatsoever if we can't see your thought process.

我们没法给你步骤分,如果看不到你的解题过程。

麻省理工公开课 - 化学原理课程节选