在数学中，提出问题的艺术必须比解决问题更有价值。

对黑洞的研究彻底改变了我们对空间和时间的理解。

所以大国攻打小国，那是互相残害，大国的错误必然反过来使其本国受害。 

I always wanted to be a singer, and I focused on that goal, even when others told me I couldn't do it.

The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little.

解释：按时饮食，身体就不会遭受灾害，强调了饮食定时的重要性。