erasable
  可清除
  erasable
  可抹除 可擦除
  E·ras·a·ble a. Capable of being erased.
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  erasable
       adj : capable of being effaced;  "the fire's worst scars were
             effaceable by a comprehensive program of
             reforestation"; "a signal too loud to be erasable in a
             single pass through the erase head" [syn: effaceable]