在数学中，提出问题的艺术必须比解决问题更有价值。
In mathematics, the art of proposing a question must be held of higher value than solving it.
I like crossing the imaginary boundaries people set up between different fields—it's very refreshing.
真相很少是纯粹的，也从来不是简单的。
The future of energy is low-carbon, but oil and gas will remain part of the mix for decades to come.
