山谷已到头，卡车三面被泥土和岩石的墙环绕。
The valley had ended and the truck was surrounded on three sides by small walls of dirt and rock.
大型动物走在水源旁边饮水时会把泥土和岩石踩松。
Large animals loosen dirt and rocks as they walk along waterways to drink.
像花园一样，一块块“湿地”上填上泥土和岩石，种上植物，吸收水分并吸附生物化合物和病原体。
Garden-like "wetland cells" layered with plants, soil, and rocks collect the water and capture biological compounds and pathogens.
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