名词
中文翻译：Unknown
同义词：
['square base', 'square bottom', 'squared surface']
例句：
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1. The square-set sill is a crucial part of the construction.
方形的底板是建筑中至关重要的部分。
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2. The square-set sill was installed to ensure stability during the construction process.
方形的底板被安装以确保施工过程中的稳定性。
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3. The square-set sill is designed to provide support for the roof structure.
方形的底板设计用来为屋顶结构提供支撑。