Covering
来自Big Physics
wiktionary
Present participle or participial adjective from cover(verb) + -ing; or, from Middle English participle form of coveren, keveren(“to cover”).
From Middle English coverynge, -inge, keverynge, -inge [ verbal noun of coveren, keveren(“to cover”)] [1]; or, verbal noun from cover(verb) + -ing.
etymonline
covering (n.)
c. 1300, "that which covers;" early 14c., "act or process of placing a cover upon," verbal noun from cover (v.).
