求翻译：这种朋友跟知己也有区别,但也可以最大限度的帮助你.当然你也有最大限度帮助对方的义务.这样的朋友通常也不会多.因为每个人都有为自己打算的权利和义务.只有很特殊的情况下你才会遇到这样的朋友.是什么意思？

This friend told friends also have differences, but can also help you maximize. of course, you also have the duty to help maximize each other. such friends is usually not much. because everyone has rights and obligations to one's own. only very special circumstances you will encounter a friend.