功能部件可以是专用的，也可以是规定的，还可以指明只是单独的软盘片。

A feature is designated as either special or specified and may be designated also as diskette-only.

youdao

功能部件可以是专用的，也可以是规定的，还可以指明只是单独的软盘片。

A feature is designated as either special or specified and may be designated also as diskette-only.

youdao