泥苔藓是许多土壤混合物的主要成份。
以相等的时间间隔，打开瓶子，将瓶内的沙土换成土壤和水混合物。
At regular intervals, a bottle is dug up, and the sand-seed mix is transferred into a shallow tray of soil and watered.
堆肥腐烂有机体的混合物，如树叶或粪便，用来改善土壤结构并增加土壤养分。
A mixture of decaying organic matter, as from leaves and manure, used to improve soil structure and provide nutrients.
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