For certain wavelengths of light, routers along that path would accept signals coming in from only one direction and send them off in only one direction.
这条链路上的路由器对某种特定波长的光束,只接受从一个方向进入的信号,也只向一个方向发送这些信号。
A directional light doesn't have a position, only a direction.
定向光没有位置,只有方向。
I only have to run, to see light cognitive direction.
我只有奋力奔跑,才能看见光亮认知方向。
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