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美国人用盐水灌溉农田，不怕把庄稼浇死吗？盐水浇地能起什么用？
美国人简直太奇怪了，别的国家都在想办法改善盐碱地，他们却直接往农田里灌溉盐水。美国人为什么要往农田灌溉盐水，他们不怕把庄稼浇死吗？
不可思议的科普9/71
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