首先，如果计算单元中的某些节点在一段时间(比如密钥寿命的两倍)内一直停机，它们就会丧失通信能力。
First, if some nodes in your cell are left down for extended periods of time (likely twice the key lifetime), the nodes can lose the ability to communicate.
针对星球机器人分布计算系统容错的可靠组播通信，提出了一种基于向量时间的原子组组播协议。
An atomic multicast protocol based on vector time is proposed for reliable group communication of distributed computing sys - tem of planetary rover.
有的研究考虑了联盟形成的成本，但是联盟形成的通信、时间成本高，计算复杂。
Finally, although some research take cost into consideration, the cost of time and communication is very high and the computation method is fairly complicated.
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