名词
中文翻译：桶形拱顶
同义词：
['barrel vaulting', 'barrel vault', 'barrel vaulting']
例句：
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1. The vault is designed to protect the treasures inside.
这个拱顶被设计来保护里面的宝藏。
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2. The vault was constructed using reinforced concrete.
这个拱顶是用加固混凝土建造的。
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3. The vault has a secret compartment that can only be accessed with a combination lock.
这个拱顶有一个秘密隔间，只能用组合锁才能打开。