de·riv·able /dɪˈraɪvəbəl/
  (a.)可引出的,可誘導的,可推論的
  De·riv·a·ble a.  That can be derived; obtainable by transmission; capable of being known by inference, as from premises or data; capable of being traced, as from a radical; as, income is derivable from various sources.
     All honor derivable upon me.   --South.
     The exquisite pleasure derivable from the true and beautiful relations of domestic life.   --H. G. Bell.
     The argument derivable from the doxologies.   --J. H. Newman.
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  derivable
       adj : capable of being derived