Friendships in childhood are usually a matter of chance, whereas in adolescence they are most often a matter of choice.

Friendships in childhood are usually a matter of chance, whereas in adolescence they are most often a matter of choice.

童年时期的友谊通常是一个机会的问题，而青少年时期的友谊通常是一个选择的问题。

-- David Elkind 戴维·埃尔金德