All of this was scoured out by the lava and then the roof area was the top that crusted over.

这个由熔岩冲击而成，顶部就是熔岩冷结后变硬所成。

Hundreds of millions of years of rain erosion has not only carved out peaks, but also scoured out caves underground.

数亿年的降雨冲刷不仅雕刻出一座座山峰也在地下冲刷出一个个溶洞。

All of this is scoured out by the lava.

所有这些都被熔岩冲刷掉了。

Over the years, the stream had scoured out a round pool in the rock.

【scour】经年累月，溪水在岩石上冲出了一个圆圆的水潭。

Their basins were not merely remodeled and scoured out by this mighty agent, but in the first place were eroded from the solid.

他们的盆地不仅被这个强大的代理人改造和冲刷干净， 而且首先从固体中被侵蚀掉。