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科技英语的主要特点有：一、阐述性、论述性和指南性强，感情色彩弱 Water may fill a crack in a rock; it freezes when it is very cold and, in doing so, makes the crack wider. Gradually, little pieces of rock break away．水可以灌满岩石的裂缝；严寒的时候，水就结成冰，而水一结冰就加大岩石的裂缝。小块的岩石就逐渐剥落下来。