The client connects to the primary database using the public network using a virtual IP address.

客户端使用一个虚拟ip地址，通过公共网络连接到主系统数据库。

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This provides an added degree of protection by hiding the true IP addresses of the private network from the public network.

通过对公共网络隐藏专用网络的实际ip地址，这增加了保护程度。

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The outside local addresses are used to translate the unique IP addresses, known as outside global addresses, of devices on the public network.

外部本地地址用于转换处于公共网络中设备的唯一IP地址，即外部全局地址[4]。

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Each instance belongs to a single network and any communication between instances in different networks must be through a public IP address.

FORBES: Google Announces Cloud Infrastructure Service: Google Compute Engine