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A director's vision is the soul of the film; without it, the film is just a series of images.
Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics:
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。
The target is to be the best, not to beat someone else.
我从未见过一只野生动物为自己感到难过。一只小鸟会冻死在树枝上,却从不自怜。