signal voltage drop

例句：

1. 1. The signal light on the traffic police is green.
   交通警察的信号灯是绿色的。
2. 2.The new product has a significant impact on the market.
   新产品对市场有重大影响。
3. 3.The signal from the satellite was clear enough for us to make our decision.
   卫星的信号足够清晰，让我们做出了决定。