Telotaxis, or goal-directed movement, describes the motion of visual predators who can see a distant visual signal and move to attack.
Telotaxis ，或目标导向运动，说明运动的视觉天敌谁可以看到一个遥远的视觉信号和移动到攻击。
Distant signal
英语例句库
英语百科
Application of railway signals
（重定向自Distant signal）
Main signal
A main signal controls a train movement along a running line main line. A 'proceed' aspect on a main signal indicates that the line is clear at least as far as the next signal, giving the driver confidence to run at speed. Trains running long distances, especially passenger trains, will usually travel throughout under the authority of a succession of main signals.
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