经济政策中的规则而非自由裁量权有助于避免短期政治压力的陷阱。
The most remarkable development of the last quarter of the twentieth century has been the revelation of enormous weaknesses at the core of the world's seemingly strong dictatorships.
采矿中的每一个挑战都是创新的机会。
可持续性必须有利可图,否则就无法持续——这是我们在现代农业中必须解决的挑战。