There's a radar return about a mile-and-a-half below the surface of the south pole ice that is clear-cut signs of liquid water.

在南极冰面下方约一英里半出现雷达回波，这是明确的液态水迹象。

She weighs a fixed volume of snow at various depths to determine its density. The hope is the layering they see in the pit matches the radar returns.

她称量不同深度的固定体积的雪以确定其密度。希望他们在坑中看到的分层与雷达返回相匹配。