名词
中文翻译：环形火山口
同义词：
['ring crater', 'ring valley', 'ring basin']
例句：
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1.The arc crater is a natural wonder that attracts tourists from all over the world.
环形火山口是一个自然奇观，吸引了来自世界各地的游客。
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2. The arc crater is an important geological feature that has been studied for decades.
环形火山口是一个重要的地质特征，几十年来一直受到研究。
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3. The arc crater is a unique feature of our planet's geology, and it is fascinating to study its formation processes.
环形火山口是我们星球地质学的独特特征，研究其形成过程令人着迷。