名词
中文翻译：门石
同义词：
['doorstep', 'threshold', 'threshold stone']
例句：
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1.The doorstone is a symbol of hospitality and welcome.
门石是欢迎和热情的象征。
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2.The threshold stone is an important part of the architectural design.
门槛石是建筑设计中的一个重要部分。
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3. The threshold stone was carefully placed to ensure the stability of the structure.
门槛石被小心翼翼地放置，以确保结构的稳固。