The sustainable development of the coal industry requires the coordinated efforts of policy, technology, and the market.

无人机的未来不是替代人，而是帮助人更好地完成工作。

如果你不能飞，那就跑；如果你不能跑，那就走；如果你不能走，那就爬。但无论怎样，你必须继续前进。

如果没有了解植物生长规律的农民，最先进的温室也毫无价值。

What you actually pay for something is at least twice the listed price because of the energy， time， money needed to set it up， learn， maintain， repair， and dispose of at the end. Not all prices appear on labels. Actual costs are 2x listed prices.

勇敢的人可能不会永远活着，但谨慎的人根本活不下去。