The concept of macromolecules was not easily accepted; it required a complete change in the way chemists thought about the structure of matter.
大分子的概念并不容易被接受；它需要化学家对物质结构的思考方式发生彻底的改变。
Never stop learning because the world never stops changing.
最好的领导者不只是管理人，而是激励他们管理自己。
Most of us spend too much time on what is urgent and not enough time on what is important.
至今一切社会的历史都是阶级斗争的历史，即剥削阶级和被剥削阶级之间、统治阶级和被压迫阶级之间斗争的历史。