As you can see from the radar data, there appears to be light precipitation within a 30-mile radius of the radar antenna.

正如您可以从雷达数据中看到的那样，看上去在雷达天线的30英里半径内存在弱降水。

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As soon as a helicopter goes beyond the 80-mile zone covered by land-based radar, its signal is picked up by the offshore platforms, with the data then returned to the airport.

BBC: Helicopter location system begins

Less than a mile above the crater, it sweeps the surface with ground-probing radar and begins its descent: a hundred miles per hour, fifty, twenty.

NEWYORKER: The Martian Chroniclers