量子引力问题不仅是物理学的问题，也是科学哲学的问题。

The meat processing industry has a responsibility to provide safe, high-quality products to consumers.

I play every game like it is my last.

The relation between what we see and what we know is never settled.

我反抗，故我在。

始终保持你的刀锋利，你的智慧更锋利，你的精神最锋利。