curb·stone /-ˌston/
  路邊石(a.)場外交易的,偶感而發的,非專業的
  Curb·stone n. A stone set along a margin as a limit and protection, as along the edge of a sidewalk next the roadway; an edge stone.
  Curbstone broker. See under Broker.
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  curbstone
       n : a paving stone forming part of a curb [syn: kerbstone]