fen /ˈfɛn/
  沼澤,沼池
  Fen n.  Low land overflowed, or covered wholly or partially with water, but producing sedge, coarse grasses, or other aquatic plants; boggy land; moor; marsh.
     'Mid reedy fens wide spread.   --Wordsworth.
  Note: ☞ Fen is used adjectively with the sense of belonging to, or of the nature of, a fen or fens.
  Fen boat, a boat of light draught used in marshes.
  Fen duck Zool., a wild duck inhabiting fens; the shoveler. [Prov. Eng.]
  Fen fowl Zool., any water fowl that frequent fens.
  Fen goose Zool., the graylag goose of Europe. [Prov. Eng.]
  Fen land, swamp land.
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  fen
       n 1: 100 fen equal 1 yuan
       2: low-lying wet land with grassy vegetation; usually is a
          transition zone between land and water; "thousands of
          acres of marshland"; "the fens of eastern England" [syn: marsh,
           marshland, fenland]