Perhaps they were wearing masks?
或许他们戴着面具？
Worse, protective measures like wearing face masks barely help because the particles are too small.
石远凯说，“更糟糕的是，因为颗粒太小，像戴口罩这样的保护性措施几乎不会起到什么作用。”
Worse, protective measures like wearing face masks barely help because the particles are too small.
石远凯说，“更糟糕的是，因为颗粒太小，像戴口罩这样的保护性措施几乎不会起到什么作用。”
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