以下为句子列表：
英文: Many of the activities exchanged among enterprises in a SN are of a service nature, and the final output is often a combination of tangible products and services which the end-customer purchases.
中文: 在供应网路中，企业之间有不少交易行为，本质就是服务，而最终产品往往是终端客户购买的实物产品和服务的混合体。
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