数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。

The most important thing is to always keep the user at the center of everything we do.

我们必须平衡短期能源需求与长期环境目标。

I’m positive that in 100 years much of what I take to be true today will be proved to be wrong， maybe even embarrassingly wrong， and I try really hard to identify what it is that I am wrong about today.