The Fremen removed a rock plug that opened a passage down into the native basement complex of the desert.

弗雷曼人移除了一个岩石塞子，打开了一条通往沙漠原生地下室的通道。

In the near distance, Paul saw scattered shadows telling where the line of rocks ended, the basement complex sinking beneath the dunes.

在近距离，保罗看到散落的阴影告诉岩石线的尽头，地下室建筑群在沙丘下沉没。