由于年久书纸发黄。

The book yellowed from age.

youdao

凯瑟琳用胳膊抱着她的头伏在桌上，直等到她听到撕包书纸的沙沙声音；然后她偷偷地走过去，静静地坐在她表哥身边。

Catherine leaned her head and arms on the table, till she heard the slightest rustle of the covering being removed; then she stole away, and quietly seated herself beside her cousin.

youdao

她跑进去，看见地上有一堆书和纸，上面还有桌布。

Running in, she beheld a pile of books and papers on the floor, with the table-cover on top.

youdao