off layers of waves
层层的波浪
以上为机器翻译结果,长、整句建议使用 人工翻译 。
The radar sends radio wave pulses into the ice sheet, and the waves bounce off buried features, informing researchers about the characteristics of the snow and ice layers.
ENGADGET: NASA's GROVER eco-rover to examine Greenland's ice sheet (video)
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