Mental activity is the organism's dialogue with its environment.
煤炭的未来在于更清洁的技术和更智能的资源管理。
不去尝试办不到的事情, 不去追求得不到的东西, 不居于不能持久的地位, 不推行不可重复的政策。
Don't be afraid of making mistakes, be afraid of not learning.
The man who does not read has no advantage over the man who cannot read.