资料来源 : pyDict

解释的,说明的,辩明的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Explanatory \Ex*plan"a*to*ry\, a. [L. explanatorius.]
   Serving to explain; containing explanation; as explanatory
   notes. --Swift.

资料来源 : WordNet®

explanatory
     adj : serving or intended to explain or make clear; "explanatory
           notes"; "an explanatory paragraph"