If you want to fly, you have to give up what weighs you down.
数学不是一项观赏性运动。
我不是得分手,我是一个篮球运动员。
科学发现的旅程充满了挑战,但也非常值得。
自然为万物安排了合适的时间。
Development economics is ultimately about improving people's lives.