The coal industry has been the backbone of America's energy independence for generations.
維護(hù)程序的最好方法是維護(hù)它。
橢圓曲線的算術(shù)是數(shù)論中更深層結(jié)構(gòu)的一個縮影。
Never underestimate the power of hard work and perseverance.
The development of the industry requires the joint promotion of policies, technology, and the market.
土地是我們最偉大的老師，我們必須傾聽它并向它學(xué)習(xí)。