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.
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。
John: Go along North Street, turn left down West Street, take the second turning on the right, that's Green Street.
约翰：沿着北大街走，然后往左拐到西街，在第二个路口向右拐，那就是格林大街。
Attendant: Just take a left down that hallway and follow the signs. You can't miss it.
服务员：左转沿着走廊，然后跟着指标走，你就会看到了。
These 4 keys correspond to the left, down, up and right arrow keys respectively.
这四个键分别对应了左、下、上、右这四个方向键。
These 4 keys correspond to the left, down, up and right arrow keys respectively.
这四个键分别对应了左、下、上、右这四个方向键。
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