Certain planetarium-type software programs (generally on CD-ROM) that do not give the full-precision positions for GSC stars.

类似于天象演示的软件（往往是在光碟中），这些软件不能给出很精确的位置坐标。

youdao

We introduce a new solution for book-accompanying CD-ROM: virtual drive. A type of virtual drive is recommended, and its installation, compilation and usage is introduced.

本文提出了用虚拟光驱对随书光盘进行管理的解决方案：虚拟光驱。我们推荐了一款虚拟光驱软件，并介绍其安装配置和使用方式。

youdao