您要查找的是不是：
- radar echol signal 雷达回波信号
- 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。
- They picked up the yacht on their radar screen. 他们在雷达屏上看到了那艘游艇。
- The radar scanned the sky for enemy planes. 雷达密切监视天空，搜索敌机。
- A red light is usually a signal of danger. 红灯通常是危险的信号。
- The watchtower followed the aircraft by radar. 瞭望塔通过雷达追踪这架飞机的行踪。
- Enemy ships were detected on the radar screen. 敌舰的影像已显现在雷达(屏幕)上。
- I stood watching for the signal to change to green. 我站着等待交通信号转为绿灯。
- A gunboat was detected by the radar. 雷达探测出一炮艇。
- 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。
- Enemy aircraft were detected by our radar. 敌机被我方雷达发现。
- The ship was provided with radar equipment. 那船装有雷达设备。
- A red lamp is often a danger signal. 红灯常常是危险的信号。
- There are enemy aircraft on the radar screen. 雷达萤屏上出现了敌人的飞机。
- A reflected signal on a communication channel. 一种在通信信道上反射回来的信号。
- Our radar pinpointed the attacking planes. 我们的雷达确定了来袭敌机的精确方位。
- The rise in prices was a signal for rebellion. 物价上涨引起了叛乱。
- Radar is used to detect objects in the air or at sea. 雷达被用来探测空中或海上的目标。
- A channel over which pilot signal is transmitted. 可在其上传输导频信号的一种信道。
- A reflected wave received by a radio or radar. 反射波收音机或雷达接收到的反射波
