Gravity explains the motions of the planets, but it cannot explain who set the planets in motion.
引力解释了行星的运动，但它无法解释是谁让行星运动起来的。
The Internet is a reflection of our society and that mirror is going to be reflecting what we see. If we do not like what we see in that mirror the problem is not to fix the mirror, we have to fix society.
我写作是为了理解这个世界，给它一个形状，一个形式。
Sustainability isn't an option; it's a necessity for the future of our planet.
我们今天种下的每一粒种子都是对后代的承诺。