利润和可持续性并不相互排斥；它们必须齐头并进。

I love competing. I love playing. I love trying to beat the best players in the world.

过去是一个无处不在的阴影。

真相很少是纯粹的，也从不简单。

I have held many things in my hands, and I have lost them all; but whatever I have placed in God's hands, that I still possess.

粒子的概念只是一个近似，在经典极限下有效。