名词
中文翻译：熔岩洞
同义词：
['volcano', 'lava tube']
例句：
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1.The volcano erupted, and the lava flowed into the sea.
火山喷发，熔岩流入大海。
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2.The lava tube is a unique geological feature that can be explored by tourists.
熔岩管是独特的地质特征，游客可以探索。
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3. The lava cave was formed millions of years ago, and it's still active today.
熔岩洞形成于数百万年前，至今仍活跃。