### Chinese: 其次在选择之前打探一下这个培训机构，最好可以打探一下这个机构出来的学生，毕竟只有机构的学生才知道这个机构到底怎么样，讲解的课程是好或者不好。
### English: Secondly, before choosing this training institution, it is best to explore the students coming from this institution. After all, only the students of an institution know what is going on, and whether the courses presented are good or not.
### Errors: There is a minor error at "training". There is a minor error at "explore". There is a minor error at "coming". There is a minor error at "on".

### Improved English: Secondly, you shall do some research on the agency before choosing it; it’s best to contact former students of the agency; after all, only students know how the agency really is and whether the curriculum is good or not.