I've heard it said that there is no way for you to ever reach native proficiency in a language if you haven't started studying it before the age of twelve.
形式是暂时的，等级才是永恒的。
Form is temporary, class is permanent.
根据国土安全部的规定，目前的安全水准是橙色等级。
The security level, as established by the Department of Homeland Security, is orange.