1. 屬一群擁有共同祖先和明顯特征的有機(jī)體，尤指屬于同一物種的一群，通過人工選擇來發(fā)展，通過有控制的繁殖來維持
   A group of organisms having common ancestors and certain distinguishable characteristics, especially a group within a species developed by artificial selection and maintained by controlled propagation.
2. 先驅(qū)生物能在不毛之地生存的某種動(dòng)物或植物種類
   An animal or plant species that establishes itself in a previously barren environment.
3. 污染對(duì)這一物種的繼續(xù)生存造成了威脅。
   Pollution poses a threat to the continued existence of this species.

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