Commensal associations sometimes involve one species' obtaining food that is inadvertently exposed by another.
共生关系有时候表现为：一个物种寻觅的食物会经由另外一个物种不经意地暴露出来。
They added more than 100,000 additional associations between genes and traits in species including mice, yeast and nematode worms.
他们又另外往里输入了超过100，000种基因和物种特征之间的相互关系，这些物种包括老鼠，酵母菌和线虫。
Some associations of species are almost a form of commensalism .
有些种类的组合几乎是共栖的形式。
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