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Many hollows have smooth , flat bottoms and feature highly reflective material .

许多空洞拥有光滑平坦的底部，显示出高反射率材料的特点。

Dubbed hollows , the depressions are often seen in clusters on the walls , floors , and peaks of craters .

这些凹陷处被称为空洞，在陨石坑的坑壁、坑底和最高点成群地出现。

His great-niece , rosie woolum , tells a story about growing up in the hollows .

他的侄孙女罗斯乌鲁木讲述了他在山谷长大的故事。

The prepared victory speech delivered before the result was in , sound in hollows .

选举结果出来后，胜利的演讲稿也准备好了。他用低沉的声音致辞道：

To locate the underground stores , gatherers looked for entryways to burrows or thumped the ground and listened for hollows .

为了定位那些地下商店，搜集者们用挖掘或敲击地面，听底部空洞的声音来寻找洞穴。