signal data processor

例句：

1. 1. The policeman used his flashlight to signal the driver to stop.
   警察用手电筒示意司机停车。
2. 2.The new traffic light at the intersection is a good signal for drivers.
   交叉路口的新交通灯对司机来说是个好信号。
3. 3.The ship's radio was a simple signal that could be heard from far away.
   船的无线电是一个可以远距离听到的信号。