Forest canopies serve as natural buffers against wind and rain, and the deep roots of trees help keep the granular soil from shifting.
森林的树冠作为自然缓冲，抵挡着风和雨的侵袭，而树木的深根也防止了水土流失。
2
It is different from settled farming because shifting cultivators raise crops in a place for only as long as the soil allows the crops to grow well.
它不同于固定的耕种，因为轮作耕种者在一个地方种庄稼的时间长短要视那里的土壤适合庄稼生长的时间而定。
3
In coastal area deep foundation pit excavating meets problems of slope collapsing and shifting sand due to high water level and the sand soil geological condition.