Their device relies on cheap and abundant elements like carbon, iron and potassium to form compounds that are nontoxic, fire-resistant and generally safer.
他们的设备依靠廉价和丰富的元素，如碳、铁和钾的形式，是无毒的化合物，和一般的安全防火。
Their device relies on cheap and abundant elements like carbon, iron and potassium to form compounds that are nontoxic, fire-resistant and generally safer.
他们的设备依靠廉价和丰富的元素，如碳、铁和钾的形式，是无毒的化合物，和一般的安全防火。
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