覆盖物在土壤与空气之间形成屏障。
盖土形成土壤与空气之间的屏障，其结果是，被覆盖的土壤在夏季会较凉爽，而在冬季，不会让土壤像没有盖土的区域一样冻得那么深。
Mulch forms a barrier between the soil and the air. As a result, mulched soil will be cooler in the summertime. And in winter, it may not freeze as deeply as areas without mulch.
她说，大自然提供的物质与服务，比如清洁空气、雨水和肥沃的土壤，不应被认为是当然的存在。
She says that the goods and services provided by nature - like clean air, rain or fertile soils - should not be taken for granted.
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