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https://www3.nhk.or.jp/nhkworld/en/ondemand/video/5001289/?cid=wohk-yt-2004-corona03-hp
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https://www3.nhk.or.jp/nhkworld/en/ondemand/video/?cid=wohk-yt-2004-corona03-hp

In the fight against the coronavirus pandemic, a new research reveals how tiny droplets carrying the virus can remain in the air for some time.

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