It is a natural process and extinction is the fate of any animal that has specialized too far to change when its environment changes, or has to compete with a better-adapted and more powerful animal.
这是一个自然过程，任何一种过于特化而不能随环境改变而改变的动物，或者任何一种与适应性更强、更厉害的动物来竞争的动物，灭绝都是其必然的命运。
Town is the greatest creation of objects, as well as human intervention on the natural environment of the strongest, most changes in the natural environment.
城市是人类最大的创造物，也是人类对自然环境干预最强烈、自然环境变化最多的地方。
Chapter two analyzes the city, s natural and social environment, s historical changes and the city, s structure, s transformation, and points out the present problems in the preservation of the city.
第二章：分析了名城开封的自然、社会环境的历史变迁以及开封形态的演变因素，指出了当今开封名城保护存在的问题。
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