引言

wǒ yǐ jīng xiě hǎo le gāi shū de yǐn yán

我已经写好了该书的引言。

I have finished my introduction to the book.

cǐ shū de yǐn yán jiǎn duǎn

此书的引言简短。

The book's introduction is brief.

wǒ jī hū wán chéng le gāi shū de yǐn yán

我几乎完成了该书的引言。

I have almost finished my introduction to the book.