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soil is needed to grow plants and keep them healthy.
网校学员傍晚天**在学习英语零基础直达PETS三级/公共英语三级【年中特惠班】时提出了此问题，已有1人帮助了TA。
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AnnieGuo0909
同学你好，该知识点来自沪江网校《英语零基础直达PETS三级/公共英语三级【年中特惠班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学好：is needed 是被动语态的谓语结构。
按照字面翻译是：土壤是被需要的，用来种植植物以及使它们保持健康。
再按照汉语的表达习惯整合一下就是：土壤是植物生长和保持健康所必需的。
祝学习愉快！
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英语零基础直达PETS三级/公共英语三级【年中特惠班】
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