The only way to learn mathematics is to do mathematics.
I'm not a role model, I'm a free spirit.
We must balance economic growth with environmental responsibility.
一个社会的竞争优势不是来自学校把乘法和元素周期表教得多么好,而是来自他们激发学生想象力和创造力的程度。
The longer I am out of office, the more infallible I appear to myself.