他们认为这可以让地里的土壤更富含矿物质，变得更肥沃。
They feel that this makes the soil in their fields ______ ______ ______ and so more fertile.
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他们认为这可以让地里的土壤更富含矿物质，变得更肥沃。
They feel that this makes the soil in their fields ______ ______ ______ and so more fertile.
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