科学是一个永无止境的旅程，总有更多的东西需要学习和发现。

I do not know much about it, but I think some of America's best young men served in this war.

Short-term gains should never compromise long-term sustainability.

宇宙是一个相当大的地方。如果只有我们，那似乎是对空间的极大浪费。