简单植物类型内昆虫群落变化无明显规律性。
But in the simple plant type the variation of the insect community had no obvious regularity.
研究人员发现，这两天的每个位置上，鞋底与地板上的微生物群落变化非常相似。
Between each location over the two days, the researchers found that changes in the shoe microbial communities closely resembled those that were seen in the floor microbial communities.
生态学家使用“演替”一词来指植物群落和生态系统随时间发生的变化。
Ecologists use the term "succession" to refer to the changes that happen in plant communities and ecosystems over time.
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