What's worse, many people are cutting ting down increasing number of trees, causing soil erosion.
更糟的是，很多人都在削减婷下来越来越多的树木，造成水土流失。
2
It was found that soil erosion resistance increased with the number of plant roots, though no consistent quantitative functional relationship was observed between them.
研究发现，土壤抗侵蚀性随着植物根系数量的增加而提高，但未有一致的定量函数关系。
3
When the number of downfall days is less than 20 annually, soil erosion degree increases along with the increase of downfall days.