pref·a·to·ry /ˈprɛfəˌtori, ˌtɔr-/
(a.)前言的,序文的
Pref·a·to·ry a. Pertaining to, or of the nature of, a preface; introductory to a book, essay, or discourse; as, prefatory remarks.
That prefatory addition to the Creed. --Dryden.
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prefatory
adj : serving as an introduction or preface [syn: introductory,
prefatorial]