... 简单撞击坑;simple impact crater 复杂撞击坑;complex impact crater 防缩孔剂;anticratering agent ...
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复杂撞击坑
Complex impact crater
以上为机器翻译结果，长、整句建议使用 人工翻译 。
简单环形山形状好像一个碗，复杂环形山则有一个小山丘在陨坑中间，这个小山丘是由撞击后物质反弹所形成。
The simple crater has a bowl shape. The complex crater has a small hill at the center, which was caused by the rebound of the material at the center.
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