Scientists now say they know the simplest material for DIY face masks. 科学家们表示,现在他们已经知道了DIY口罩的最佳材料。 The coronavirus pandemic has prompted a heated debate over the efficacy of…
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Scientists now say they know the simplest material for DIY face masks. 科学家们表示,现在他们已经知道了DIY口罩的最佳材料。 The coronavirus pandemic has prompted a heated debate over the efficacy of…