VCS的设计，要求在节点之间至少有两个可用的有心跳能力的链路用于防止网络故障。
The design of VCS requires that a minimum of two heartbeat-capable channels be available between nodes to protect against network failure.
单向阀被设计成在停电时预防水回流，防止可能发生的故障。
One-way valve is designed to prevent water in the return of the blackout to prevent failures that may occur.
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