名词
中文翻译：洞穴
同义词：
['cave', 'hollow', 'pit']
例句：
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1. The explorers discovered a new cave in the mountains.
探险队在山区发现了一个新的洞穴。
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2. The cave is filled with bats during the night.
这个洞穴在晚上充满了蝙蝠。
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3. The cavern was filled with stalactites and stalagmites.
这个洞穴被石笋和石柱填满了。