全球性挑战需要全球合作。

We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.

Collaboration in science bridges gaps between what we know and what we can discover.

一个句子的意义不仅仅在于词语本身，还在于它所执行的言行行为。