交警发出信号示意车辆缓慢前行。
电子信号用接近光速的速度传输信息——要比那些缓慢，冻得发抖的签证队列中的人们前行的速度快千万倍。
Those electronic signals move information almost at the speed of light-billions of times faster than the shuffling, shivering humans in the visa queue.
有时候作为局内人我们总是看不清这些信号，或是信号来的过于缓慢。
Sometimes we are too close to see the signs, or the signs appear too gradually.
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