Secondary DNS servers transfer their zone information directly from the primary DNS server and keep a copy locally.

辅助DNS服务器直接从主d NS服务器传输其区域信息，并在本地保留副本。

youdao

Soicher found a copy of a shooting game called "Kill Zone, " she laid it on the kitchen counter so Brock would know he'd been busted.

WSJ: Radical Videogamers Go on Nonkilling Spree