1. The book has a preface written by the author.
    该书有作者写的序言。

2. The sales manager, who was quick-witted, replied: "My company cannot afford a two-volume edition, sir, but we could offer you a copy with a preface!"
    头脑灵活的销售经理答道："先生，两卷本公司买不起，不过我们可给你弄一本带‘前言’的！"

3. Cloning is a radical challenge to the most fundamental laws of biology, so it's reasonable to be concerned that it might be a preface to activities that will threaten human society and dignity.
    克隆向生物学最基本的规律发起了一次革命性的挑战，因此有理由担心这或许是威胁人类社会和人类尊严的活动的序曲。