pad·dock /ˈpædək, dɪk/
  圍場
  Pad·dock, n.
  1. A small inclosure or park for sporting. [Obs.]
  2. A small inclosure for pasture; esp., one adjoining a stable.
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  Pad·dock n.  Zool. A toad or frog. --Wyclif. “Loathed paddocks.”  --Spenser
  Paddock pipe Bot., a hollow-stemmed plant of the genus Equisetum, especially Equisetum limosum and the fruiting stems of Equisetum arvense; -- called also padow pipe and toad pipe. See Equisetum.
  Paddock stone. See Toadstone.
  Paddock stool Bot.,a toadstool.
  paddock
       n : pen where racehorses are saddled and paraded before a race