the book cost me 12 yuan in all,postage included.为什么此处理解为独立结构,为什么不能用 is included,

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the book cost me 12 yuan in all,postage included.
为什么此处理解为独立结构,为什么不能用 is included,

如果要用is included,the sentense should be like:
the book cost me 12 yuan in all,AND postage is included.
在没有AND 情况下,postage included 作为前半部分的补充,不独立成为句子.

逗号表示一句没有结束,在无联接词的情况下一个句子中只能有一个动词
用了included就是两个动词了

The book cost me 12 yuan, included the postage.