Economic development must be coordinated with environmental protection.
圆的周长大于任何内接等边多边形的周长,小于任何外切多边形的周长。
Science is a collaborative effort; no major discovery happens in isolation.
不是有没有时间的问题,而是愿不愿意挤出时间的问题。
"The only person you should try to be better than is the person you were yesterday."