定理不是偶然发现的。

我们不能忽视煤炭的经济作用，但也不能忽视其环境影响。

All language is but a poor translation.

The great ideological battles between liberalism and communism, or between democracy and authoritarianism, have been replaced by a general consensus on the desirability of liberal democracy.

量子场论的发展表明，真空不是空的，而是充满了虚粒子。

Sustainability is no longer an option; it's a necessity for the future of leather tanning.

谷物生产的创新不仅关乎产量，更关乎韧性和适应性。