its a backup
这是备份
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The company now offers its satellite phone service as a transparent backup to cellular coverage through its partnerships with cellular providers.
FORBES: Magazine Article
Spurred by the 2007 raid, Knollwood solved its backup problem by cutting a new manhole and clearing a buildup of lime, grease and sludge.
WSJ: Federal Offenses: Sewage Blunder Earns Building Engineer a Criminal Record
Sure it looks great, and most reviewers are saying its home networking and backup capabilities are a step up from Vista.
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