Google运行着两种类型的IT系统：内容交付和关键业务服务。
Google runs two types of it systems: content delivery and critical business services.
容灾技术对于关键业务服务系统的运行保障有非常重要的作用。
Disaster tolerance technology plays an important role in protecting the availability of critical application systems.
高可用技术对于关键业务服务系统的运行保障有非常重要的作用。
High availability technology plays an important role in protecting the availability of critical application systems.
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