al·low·able /əˈlaʊəbəl/
  (a.)可允許的,正當的,可承認的
  allowable
  可容許 可允許
  Al·low·a·ble a.
  1. Praiseworthy; laudable. [Obs.]
  2. Proper to be, or capable of being, allowed; permissible; admissible; not forbidden; not unlawful or improper; as, a certain degree of freedom is allowable among friends.
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  allowable
       adj 1: deductible according to the tax laws
       2: deserving to be allowed or considered
       3: possible to allow; "a degree of freedom allowable among
          friends" [syn: permitted]