These are used to transmit radar signals down into the ice.

这些用于将雷达信号向下传输到冰中。

Because water (unlike ice) reflects radio waves like a mirror, the radar's signal bounced back, confirming the lake's existence.

因为水（不像冰）像镜子一样反射无线电波，雷达的信号被反射回来， 证实了这个湖的存在。

Basically, any incoming radar signals that reach the plane are dissipated away as heat thanks to some complicated physics going on in the material.

基本上，由于材料中发生了一些复杂的物理现象，任何到达飞机的传入雷达信号都会以热量的形式消散。

That helped them spot the telltale signature of a cave, as well as to work out the different radar signals given by different subsurface geometries.

这有助于他们发现洞穴的明显特征，并计算出不同地下几何形状发出的不同雷达信号。