你能告诉我获得学生签证需要做些什么，需要多长时间吗？

Could you tell me what I have to do to obtain a student visa and how long the process will take?

youdao

一周要规定多长时间学习历史和在什么年龄一定要学习历史？

For how many hours a week should history be taught in schools, and to what age should it be made compulsory?

youdao

什么多长时间了？

How long since what?

youdao