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1. Oxford American Dictionary

   tract

   • IPA[trak(t)]

   美式

   • n.
     an area of indefinite extent, typically a large one；an indefinitely large extent of something

   • noun: tract, plural noun: tracts

2. • 釋義

   n.

   名詞

   • 1. an area of indefinite extent, typically a large one large tracts of natural forest
   • ▪ an indefinitely large extent of something the vast tracts of time required to account for the deposition of the strata
   • 2. a major passage in the body, large bundle of nerve fibers, or other continuous elongated anatomical structure or region the digestive tract