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  1. duckweed

    • IPA[ˈdʌkwiːd]

    英式

    • n.
      a tiny aquatic flowering plant that floats in large quantities on still water, often forming an apparently continuous green layer on the surface.
    • noun: duckweed

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    • IPA[ˈdəkˌwēd]

    美式

    • n.
      a tiny aquatic flowering plant that floats in large quantities on still water, often forming an ...

    Oxford American Dictionary