计算无线电波 回声的时间乃是雷达运行所依据的原理。
Timing an echo of radio waves is the principle on which radar operates.
一个宁静的新泽西州小镇弹出到人们的雷达屏幕上，因为它拥有美国最古老的仍在运行核电站——而且，有人说，也是最危险的核电站。
A sleepy New Jersey town has popped onto people's radar screens because it has the oldest running nuclear power plant in the United States — and, some say, the most dangerous.
他们在橡皮船上安装了雷达发射器、接收器和天线，在浮动冰架间运行的过程中接收有价值的数据。
They fit a radar transmitter, receiver and antennas to the kayaks, to obtain valuable data on the processes operating over floating ice shelves.
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