作者在序言中坦白承认,自己的研究仍有明显限制。Zuòzhě zài xùyán zhōng tǎnbái chéngrèn, zìjǐ de yánjiū réng yǒu míngxiǎn xiànzhì.In the preface, the author frankly admits that his research still has clear limitations.
这本书的序言写得非常动人。Zhè běn shū de xùyán xiě de fēicháng dòngrén.The preface of this book is very moving.
他用一个月时间为朋友的诗集写了序言。Tā yòng yí ge yuè shíjiān wèi péngyou de shījí xiě le xùyán.He spent a whole month writing the preface for his friend's poetry collection.