对开，(2)页码，(3)一页文稿：(1)原张纸的一半。(2)排在书页头或脚的书页次序号码。(3)单面书写的一页文字稿。

Folio: (1) Half of a broadside sheet. (2) page number at the head or foot of a page of text. (3) sheet of copy which is written on one side only.

youdao

号码更改结束时，一个合法的序号也可以。

Changing the Numbers at the end of a legitimate serial Numbers also works.

youdao

号码更改结束时，一个合法的序号也可以。

Changing the Numbers at the end of a legitimate serial Numbers also works.

youdao