Doublethink means the power of holding two contradictory beliefs in one's mind simultaneously, and accepting both of them.

The future of fishing depends on balance—between economic needs and ecological limits.

There are no rules in writing, just tools.

诗歌应当像利剑一样锋利。

量子力学不仅是关于原子的理论，更是关于整个自然的理论。

If it doesn't challenge you, it won't change you.