the earliest mobile telephones were called first generation telephone,often refered to as 1G.often refered to as 1G.是词组吗

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the earliest mobile telephones were called first generation telephone,often refered to as 1G.
often refered to as 1G.是词组吗

be refered to as 1G.通常被称为1G.
是个词组.是指被认为,被指为的意思.
1G,2G,2.5G,3G,4G都是是手机的网络制式.

最早的移动电话被称为第一代移动电话，也就是1G。
那个严格来说并不算词组，often refered to as和逗号前面的called是同位语，他们两个是一样的位置，一样的作用，都是解释最早的手机被人们称作什么

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