That was confirmed in the early 1990s by the American Magellan orbiter which used radar to peer through the planet's thick clouds and mapped out a rich, varied and dynamic surface.
2019年6月六级真题（第二套）听力 Section C
柯林斯高阶英汉双解学习词典释义
N-VAR
雷达;无线电定位装置
Radar is a way of discovering the position or speed of objects such as aircraft or ships when they cannot be seen, by using radio signals.