These textile materials act AS a barrier to the movement of soil particles but permit the flow of water necessary for adequate drainage.
这些纺织材料相当于一道屏障，它阻止了土壤颗粒的运动，但允许水的流动，以利于排水。
After negotiating a permit, which was scribbled on a note book, we continue our journey - through the barrier and up a narrow steep track of dried earth and rock formed on a landslide.
在商议了潦草地写在笔记本上的通行证后，我们继续了我们的旅程，穿越栅栏，爬上形成于崩塌的泥石上，带有干燥泥土和岩石的斜坡。
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