您要查找的是不是：
- topogenic signals 拓扑发生信号
- A red light is usually a signal of danger. 红灯通常是危险的信号。
- Signals control each section of the railway track. 各种信号控制着铁路轨道的每个部分。
- I stood watching for the signal to change to green. 我站着等待交通信号转为绿灯。
- Let's set the clock by the radio time signal. 咱们照着收音机的报时信号把钟对一对。
- A period signals the end of a sentence. 句号表示一个句子结束了。
- A red lamp is often a danger signal. 红灯常常是危险的信号。
- A reflected signal on a communication channel. 一种在通信信道上反射回来的信号。
- The lighthouse flashes signals twice a minute. 灯塔每一分钟发出两次信号。
- The rise in prices was a signal for rebellion. 物价上涨引起了叛乱。
- The ship's radio sent out signals for help. 轮船上的无线电发出求助信号。
- The signals go to and fro at a very high but almost constant speed. 那些信号用非常快但几乎不变的速度来回传送。
- A channel over which pilot signal is transmitted. 可在其上传输导频信号的一种信道。
- The signal was picked up by a downrange radar station. 该信号被试验飞行方向之内的雷达站收到了。
- The quarterback barked out the signals. (橄榄球赛中的)四分卫厉声发出信号
- The driver is winking his lights to signal a turn. 驾驶员打着一闪一闪的灯光信号表示要转弯。
- Everyone uncovered when the signal sounded. 信号响时，人人脱帽致敬。
- The train must stop when the signal's red. 信号机是红色时,火车必须停驶。
- A red lamp is used as a danger signal. 红灯用作危险信号。
- Send out a distress signal; the ship is sinking. 船正在下沉，发遇险信号吧。
