单语范例（未经PONS编辑处理）
英语
- Defending territory from rivals (known as territoriality) is a learnt adaptive behaviour performed by several ecological species.en.wikipedia.org
- Since they serve different ecological functions in the water than they do in land, the loss of one amphibian species is equivalent to the loss of two ecological species.en.wikipedia.org
- This reveals an important discrepancy between the resolving power of current forensic analytical chemistry and biological responses of keystone ecological species in oiled habitats.www.bitsofscience.org
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