农业中的每一个挑战都是创新和改进的机会。
The future of global politics will be shaped by the competition between democratic and authoritarian systems.
Prices are important not because money is considered paramount but because prices are a fast and effective conveyor of information through a vast society in which fragmented knowledge must be coordinated.
计算机科学的挑战不仅在于构建更快的机器,更在于理解计算可能性的基本结构。