the results are even more serious, for where there are their roots_______ the soil up allowing the rain to sink in and also the soil, thus preventing it being washed away easily幫忙看看該選什么,為什么? 怎么翻譯?

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tighten.這樣的后果很嚴重，因為它們的根系固緊土壤并使得雨水容易滲透進土壤，同時土壤也（通過它們的根系）保護它們免被沖走。