touch·wood /ˈtʌʧˌwʊd/
  火絨,捉迷藏的一種
  Touch·wood n.
  1. Wood so decayed as to serve for tinder; spunk, or punk.
  2. Dried fungi used as tinder; especially, the Polyporus igniarius.
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  touchwood
       n : material for starting a fire [syn: kindling, tinder, spunk,
            punk]