Fertilizer use differs from country to country, and from too little to too much. Nitrogen and phosphorus can produce big crops,but . But they can also pollute water and air.
英
美
释义
肥料在不同的国家,用太少或太多,都会有不同。氮和磷能使农作物长得更壮,但是,他们也会污染水和空气。
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