Starting with Firefox 3, this property is now also updated when the browser automatically detects that the network is unreachable.

从Firefox 3开始，当浏览器自动检测到网络不可用时，这个属性也会更新。

It is possible that your program will receive a network of connections that excludes some persons, i. e. Some people may be unreachable.

它可能是你的程序将会收到一个网络连接的排除有些人，如某些人可能是遥不可及的。

To setup NAT networking you need to select a network number that is normally unreachable from the host.

要正确设置NAT网络，我们必须选择一个从宿主机无法访问的网络地址(笔者注：和宿主机物理网卡不在同一个网段)。

To setup NAT networking you need to select a network number that is normally unreachable from the host.

要正确设置NAT网络，必须选择一个从宿主机无法访问的网络地址。