Is the ideal age.

This is under normal circumstances.

Exceptions under special circumstances

According to scientific evidence

Well, when W is old, it will definitely affect the effect

Age size

also not line

I don't know how to cooperate

Not aware of this problem

principle

serious

therefore

Appropriate age

Particularly important

can

get twice the result with half the effort

bear fruit

Personal point of view

jgxkao

Good luck and have fun every day.