类群之间的差异和每个类群内部的相似性使大多数生物学家确信，生命之树只有两个树干。
The differences between the groups and the similarities within each group made it seem certain to most biologists that the tree of life had only two stems.
在影片中，反派为一家试图在一颗遥远星球上开采矿物的公司工作，在此过程中使一群热爱自然的类人生物失去了家园。
In the movie, the villains work for a corporation intent on mining a mineral on a far-off planet, dislocating a population of nature-loving humanoids in the process.
土壤微生物是由完全不同的和无孔不入的有机体类群所组成。
Soil micro-organisms constitute a diverse and ubiquitous group of organisms.
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