The most important political development of the last two centuries has been the rise of the modern state.
我们不能忽视煤炭的经济作用,但也不能忽视其环境影响。
The path to clean energy begins with making current practices cleaner.
世界充满了神奇的东西,它们在耐心地等待我们变得更有智慧。
The best way to predict the future is to create it.