【#波蘭空氣污染】波蘭抗霧霾新招！科學家用「聲波大砲」擊退PM2.5，降低有毒微粒濃度！| 寰宇#關鍵字新聞2022.01.23
寰宇#關鍵字新聞 Global Hashtag News · 寰宇新聞台
January 23, 20221m 28s
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