mac头像更改（mac怎么修改解锁时的头像）

 Life is sad at times, but it is up to you to make your own life happy. 生活有时是令人沮丧的，但你可以努力让自己的过得开心。

 It'd be better to light up the candle than curse the darkness.No one can give you brightness expect yourself. 与其诅咒黑暗，不如燃起蜡烛。没有人能给你光明，除了你自己。

 You are the only exception. 你是唯一的例外。

 Hope for the best ,prepare for the worst. 抱最好的希望，做最坏的打算。