例如，外来植物的入侵可能会改变落叶的数量，从而改变对土壤的营养贡献。
For example, an invading nonnative plant could alter the quantity of leaf litter production, which would alter nutrient contributions to the soil.
仅相隔了一代人的时间，数百万母亲已经出去工作，从而改变了家庭经济的基本模式。
In just one generation, millions of mothers have gone to work, transforming basic family economics.
这可能会导致河里的水生植物快速生长，从而导致水道被生物体堵塞，从而改变水流。
This could cause rapid growth of water plants in the river, which can lead to the water ways getting clogged with organisms, which can change the flow of the water.
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