The advantages found in history seem to be of three kinds， as they result either from the mere situation of the climate and country or from the form of government and of the character of the people， or from those finer principles and morals， which may be called the recommendations of philosophy.

技术将在减少排放同时满足能源需求方面发挥巨大推动作用。

位置测量越精确，动量测量就越不精确，反之亦然。