受试者被分成九组，每组大约两百人。
The people were divided into nine groups of about two hundred people each.
这需要交易九组水晶(如果你到达rank9还没有作其他任务的时候)(译注：多余)。
This requires trading 9 stacks of crystals (if you have not done any other missions since reaching Rank 9).
课程成绩基于三次不积累的考试(占最后分数85%)和大约九组问题集(占最后分数的15%)。
The course grade will be based on three non-cumulative exams (85% of the final grade) and approximately nine problem sets (15% of the final grade).
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