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  1. pond scum

    美式

    • ph.
      浮在死水上面的綠藻類層
  2. 知識+

    • 英文詩詞要配合風景畫的!

      ... clouds of may Shade half the pond. Beyond, All but one bay Of emerald... light wind frets And drifts the scum Of may-blossom. Toll the moorhen calls...