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.
但在中国，“目前我们还很少进行这样的研究”，石远凯说。
Yet, in China, "we have few such studies", said Shi Yuankai.
但在中国，“目前我们还很少进行这样的研究”，石远凯说。
Yet, in China, "we have few such studies", said Shi Yuankai.
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