physical delivery service
physical delivery service
实物交付服务
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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However, the existing context service infrastructure rarely considers the relationship to physical space, and they are limited with respect to system size, service delivery, scalability, etc.
然而，现有上下文服务基础设施较少考虑与物理空间的对应关系，并在系统规模、服务提供方式、扩展性等方面存在局限。
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