名词
中文翻译：洞
同义词：
['cave', 'cellar', 'den', 'hole', 'shelter例句：1. The old man lived in a small bolthole in the mountains.（那位老人住在山里的一个小洞里。）']
例句：
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1. The old man lived in a small bolthole in the mountains.
那位老人住在山里的一个小洞里。
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2. The thief hid his stolen goods in a bolthole under the floorboards.
贼把偷来的东西藏在地板下的地窖里。
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3. The cave was filled with bats and the sound of their wings echoed through the bolthole.
洞穴里充满了蝙蝠，它们的翅膀声在地窖中回荡。