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。
He allowed himself to be swayed by his conviction that human beings are not born once and for all on the day their mothers give birth to them, but that life obliges them over and over again to give birth to themselves.
Collaboration across industries is key to solving the complex challenges of marine conservation.