Coal and natural gas are mainly used for electricitygeneration, whereas oil is used mostly to power transportation, yet the prices of all these energy sources are linked.
煤炭和天然气主要用于发电，而石油主要用于给运输提供能量，但所有这些能源的价格是相互关联的。
2
Traditional electricitygeneration is inherently wasteful.
传统的发电方式有着固有的浪费性。
3
The closest substitute for coal in electricitygeneration is natural gas.