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並前往https://www.nist.gov/news-events/news/2020/11/new-airflow-videos-show-why-masks-exhalation-valves-do-not-slow-spread

New Airflow Videos Show Why Masks With Exhalation Valves ...

This video, created using a schlieren imaging system, shows airflow dynamics when wearing an N95 mask with an exhalation valve (left) and ...

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