名词
中文翻译：洞
同义词：
['cave', 'crevice', 'fissure']
例句：
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1. The explorers found a hidden corvette in the depths of the ocean.
探险者们在海洋深处发现了一艘隐藏的快艇。
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2. The cave was dark and damp, making it difficult to navigate.
这个洞穴又黑又潮湿，很难导航。
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3. The corvette was used for military purposes during World War II.
这艘快艇在第二次世界大战期间被用于军事目的。