Sometimes when you're putting the work in it just seems so, so hard, and you never know when that work's going to pay off.

Sometimes when you're putting the work in it just seems so, so hard, and you never know when that work's going to pay off.

有时候，当你投入工作的时候，你会觉得非常非常辛苦，你永远不知道什么时候你的努力会有回报。

-- Maria Sharapova 玛丽亚·莎拉波娃