酸和碱是互补的;没有另一个,一个就无法存在。
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。
Consciousness serves the organism's need to interact effectively with its world.
The future of coal lies in balancing environmental responsibility with energy demands.