In the late nineteenth century, ecology began to grow into an independent science from its roots in natural history and plant geography.
在19世纪后期，生态学从它的自然历史和植物地理学的根源开始发展为一门独立的科学。
It is science that teaches us to respect the natural ecology.
是科学，让我们懂得尊重自然生态。
Ecology considered as a subject belongs both to natural science and to social science, observes and studies the various environments surrounding human and their interactions systematically.
生态学被看作既是自然科学又是社会科学的学科，它对人类所处的各种环境及其相互作用进行系统考察和研究。
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