If you're brave enough to say GOODBYE, life will reward you with a new HELLO.

如果你足够勇敢去对生活说再见,那生活就会奖励你一个新的“你好”。

语言点:if you're brave enough to say GOODBYE为条件状语从句,
形容词或副词+enough:足够地……可以……
reward sb. with sth.意为:奖励某人某物。