Workers sin management, professional, and related occupations had the highest median tenure (5.5 years).

管理人员、各领域的专业人士以及从事相关工作的员工平均停留时间最长，达到5.5年。

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There are many communication ways in space information network(SIN). The network topology changes dynamically, which brings out special requirements for multicast key management.

空间信息网络存在不同的通信方式，网络拓扑结构动态多变，对组播密钥管理提出了特殊的要求。

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There are many communication ways in space information network(SIN). The network topology changes dynamically, which brings out special requirements for multicast key management.

空间信息网络存在不同的通信方式，网络拓扑结构动态多变，对组播密钥管理提出了特殊的要求。

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