crater [ˈkreɪtə(r)]

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n.火山口，弹坑

the round hole at the top of a volcano , or a hole similar to this

With a telescope you can see the huge crater of Ve-suvius. 用望远镜你能看到巨大的维苏威火山口。
They came to the lip of a dead crater. 他们来到了一个死火山口。