volcanic craters 火山口
lunar craters 月球环形山
impact craters 撞击坑
formation of craters 坑洼的形成
smooth craters 平滑的凹坑
1. The moon is covered with thousands of craters.
月球表面覆盖着成千上万个环形山。
2. Geologists studied the craters left by the ancient volcano.
地质学家研究了古代火山留下的火山口。
3. The meteor created a huge crater in the field.
那颗陨石在田野上撞出了一个巨大的坑。
A: Did you see the photos of the moon taken by the telescope?
A：你看到望远镜拍的月球照片了吗？
B: Yes, it's amazing how many craters there are.
B：是的，那里有那么多环形山，真令人惊叹。
1) 火山口
2) 环形山（月球等天体表面）
3) 弹坑、撞击坑
1. [名词] 火山口；环形山；坑洼
e.g.
The mountain has a deep crater.
这座山有一个深邃的火山口。
noun
1. A bowl-shaped depression on the surface of the Earth or another celestial body, usually formed by a volcanic eruption or a meteor impact.
Synonym: pit, bowl