永远不要停止学习，因为世界永远不会停止变化。
Never stop learning, because the world never stops changing.
"If liberty means anything at all, it means the right to tell people what they do not want to hear."
人类进化的故事远未结束。
在没有生命力的帮助下合成尿素是一个极其重要的事实。