The thing about happiness is that you only know you had it when it's gone.
教育学中的实验方法不仅是研究的工具，更是理解教育过程的基本原则。
Mathematics is not just about numbers—it's about patterns, structures, and relationships.
Sometimes the smallest characters have the biggest stories.
Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws.
石油化工的未来在于高附加值、低碳产品。
The best art leaves you with more questions than answers.
A law of nature， lex naturalis， is a precept or general rule found out by reason， by which a man is forbidden to do that which is destructive of his life or takes away the means of preserving the same.
