资料来源 : pyDict

难获得的

资料来源 : WordNet®

unobtainable
     adj : not capable of being obtained; "a rare work, today almost
           inaccessible"; "timber is virtually unobtainable in the
           islands"; "untouchable resources buried deep within the
           earth" [syn: {inaccessible}, {unprocurable}, {untouchable}]