The rules of the building.
Answer rules: high school student answer .
middle school student.
middle school student answer primary student.(look's like we don't have primary school student.)
Anyone can't necessary answer .
(看在我打了这么多字，别删啊)
Answer rules: high school student answer .
middle school student.
middle school student answer primary student.(look's like we don't have primary school student.)
Anyone can't necessary answer .
(看在我打了这么多字，别删啊)
