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Logistics service is a balance of service priority and cost.

物流服务是服务优先与成本间的平衡。

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This step requires a default service class, for which messages of unknown priority type can be assigned.

此步骤需要一个缺省服务分类，用于分配未知优先级类型的消息。

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To that end, the United States Citizen and Immigration Service has a high priority goal of moving 40 percent of its service delivery online by 2011.

WHITEHOUSE: "Doing What Works" Transcript

Get your fill of freebies and discounts from O2's exclusive Priority Moments service?

ENGADGET: Nike and O2 team up to offer Priority Sports hub: Nike+ running Android app becomes O2 exclusive

She added that the priority all along had been to find a way of restoring the service for the long term.

BBC: Transplant unit to resume work