By contrast, Aristotle considered the investigation of living things, and especially animals, central to the theoretical study of nature.
比较而言，亚里士多德认为研究生物，尤其是动物，是对自然的理论研究的核心部分。
Ecology is the study of the nature of the interrelationship between the natural environment and living things.
生态学的本质是研究生物与自然环境相互关系的科学。
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