epigraph

1. N-COUNT An epigraph is a quotation at the beginning of a book or chapter of a book. (卷首或章節前的)格言; 引語[usu N 'to' n]

The epigraph to O'Rourke's book is from de Quincey's Confessions of an English Opium Eater. 奧羅尅著作卷首的引語取自德·崑西的《癮君子自白》。