ar·a·ble /ˈærəbəl/
  (a.)適于耕種的,可耕的
  Ar·a·ble a.  Fit for plowing or tillage; -- hence, often applied to land which has been plowed or tilled.
  Ar·a·ble, n. Arable land; plow land.
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  arable
       adj : (of farmland) capable of being farmed productively [syn: cultivable,
              cultivatable, tillable]