If your pushful word is bought small, be economical, anyway I am to buy big, save worry.
如果你有精力的话就买小的，省钱，反正我是买大的，省心。
Of course, the relevant course of the graduate student level that some schools offer also is important very, pushful classmate is OK referenced study.
当然，有些学校开设的研究生阶段的相关课程也很是重要，有精力的同学可以参考学习。
应用推荐