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perfect (adj.)[perfect 词源字典]: early 15c. alteration of Middle English parfit (c. 1300), from Old French parfit "finished, completed, ready" (11c.), from Latin perfectus "completed, excellent, accomplished, exquisite," past participle of perficere "accomplish, finish, complete," from per- "completely" (see per) + facere "to make, do, perform" (see factitious). Often used in English as an intensive (perfect stranger, etc.).[perfect etymology, perfect origin, 英语词源]