The researchers found only limited evidence that so-called N95 facial masks, which are uncomfortable and expensive, are better than simple surgical masks.

研究人员发现，只有有限的证据表明，舒适性较差而且昂贵的N95口罩效果优于手术用口罩。

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The researchers found only limited evidence that so-called N95 facial masks, which are uncomfortable and expensive, are better than simple surgical masks.

研究人员发现，只有有限的证据表明，舒适性较差而且昂贵的N95口罩效果优于手术用口罩。

youdao