The synopsis does not replace the abstract but is an additional product.
大纲不能替代摘要，它是另外的一种形式。
How do you up-sell, or cross-sell, and introduce an additional product or service into the conversation?
你如何在谈话中追加销售、交叉销售，或是介绍一款新产品或服务？
Additional product is the product of the fourth level, namely the product contains additional services and benefits.
附加产品是产品的第四个层次，即产品包含附加的服务和效益。
Additional product is the product of the fourth level, namely the product contains additional services and benefits.
附加产品是产品的第四个层次，即产品包含附加的服务和效益。
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