煤炭开采的创新不仅仅是关于开采,而是更智能、更安全、对环境的影响更小。
The concept of law involves the union of primary and secondary rules.
仅以产量来衡量水产养殖的成功,就像用木材产量来评判森林一样。
Philosophy is an ornament in prosperity, a refuge in adversity, and a provision in old age.