副本的

He has a repetition of a previous talk.

他有前次副本。

Computer viruses are small programs, they replicate by attaching a copy of themselves to another program.

计算机病毒是一些小程序，它们把自己一个副本附加到另一个程序上面进行复制。

The CROSSCHECK command synchronizes the logical records of RMAN backups and copies with the files on storage media.

CROSSCHECK令同步RMAN备份和存储介质上副本逻辑记录。