As to the ground echoes, the important problem is shelter. Through researching the character of microwave transmission, we give a new gene named shelter gene as a discuss focus.

地面回波的模拟关键问题是遮挡问题的处理，根据微波传播的特点，重点讨论遮挡因子问题。

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In fact, we kind of assumed that they were filtering a lot out, the way a sophisticated radar system can ignore echoes from stationary objects on the ground.

事实上，我们推断蝙蝠在分析回声时过滤掉了很多因素，就像一个复杂的雷达系统可以忽略地面上静止物体的回声那样。

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The award is as much recognition of that ground-breaking quartet as of the new book, which has so many echoes of its forerunners.

这部最新作品所获的殊荣实际上也就是对他四部小说的成就给予了同样的肯定，因为它与作家的前三部小说有着如此之多的共鸣。

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Norster will hope the move echoes the success of rivals the Ospreys who ground-share with Swansea City at the Liberty Stadium.

BBC: Cardiff teams agree ground share

It is able, from the delay between the broadcast of a pulse and its reception in different places, and the strengths of the echoes, to draw a three-dimensional picture of what lies under the ground.

ECONOMIST: Archaeology