在这种情况下，应该要求每一个参与节点都有最小限度的CPU速度。
In such a case, you might want to require that each participating node have a minimal CPU speed.
这些节点可以从地面的振动测量出车辆的速度和方向。
They were able to measure the speed and direction of vehicles from ground vibrations.
然而，没有一个速度能带信息超越“最后路程”，从邻里节点传入用户家中。
No network, however, can run faster than the speed of its “last mile”, from the neighbourhood node to the house.
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