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能源需求与环境保护之间的平衡是我们这个时代的挑战。
The multiverse is not a theory, but a prediction of certain theories.
Freedom is not merely the opportunity to do as one pleases; neither is it merely the opportunity to choose between set alternatives. Freedom is, first of all, the chance to formulate the available choices, to argue over them - and then, the opportunity to choose.