You know why it's hard to be happy?It's because we refuse to let go of the things that make us sad.
问题描述：
You know why it's hard to be happy?It's because we refuse to let go of the things that make us sad.
答
to let go of...：放手，放弃
你知道为什么我们很难快乐起来吗？这是因为我们对那些让我们伤感的事情不能释怀。
答
你知道为什么很难去快乐,那是因为我们拒绝走出那些使我们难过的事.