The reason for this is easy to recognise: in nature, the existent organisms either adapt or are regularly replaced by new types.
原因很容易理解：在自然界中，现存的生物要么适应环境，要么被新物种取代。
Starting from different environmental resources, when reviewing the position of man in the relation of man and nature, they have also evaluated the value of nonhuman natural existent things.
他们从不同的环境资源为出发点，在反思人在人与自然关系中的地位同时，也评估了非人的自然存在物的价值。
This text introduces the chemistry of the environment pollution property of the heavy metals cadmium, such as existent appearance of nature.
介绍了重金属镉的环境污染化学性质，自然界存在的形态；
Unknown: at present people don't know some phenomena including the name, nature, origin and whether it is existent or not.
未知现象：目前人们还不知道的现象，包括其名称、性质、起源，以及它是否存在。
The present paper made a brief introduction to the two current major species concepts and the various types of "species" existent in nature.
对当前两种主要的物种概念和自然界存在的各种不同类型的“种”作了扼要的介绍。
The expanding of science culture broadens human's existent background, and enriches the connotation of human nature. We should establish a new culture system which is dominated by science culture.
科学文化的形成拓展了人类的生存空间，丰富了人性的内涵，当代中国应当建立以科学文化为主导的两种文化融通汇合的新型文化体系。
For intellectuals, it was the poetic description of human's nature-existent and elegantly rational taste;
对于知识阶层而言，这种关联表现为对生命本真存在的诗意表述和高雅、理性的美学情调；
For intellectuals, it was the poetic description of human's nature-existent and elegantly rational taste;
对于知识阶层而言，这种关联表现为对生命本真存在的诗意表述和高雅、理性的美学情调；
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