因为新病毒天天创建和发布，反病毒程序必须频繁地更新其(病毒特征)数据库。

Since new viruses are created and released daily, the antivirus program must update its database frequently.

youdao

因为新病毒天天创建和发布，反病毒程序必须频繁地更新其(病毒特征)数据库。

Since new viruses are created and released daily, the antivirus program must update its database frequently.

youdao