名词
中文翻译：底部构造
同义词：
['foundation', 'infrastructure']
例句：
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1. The engineer designed the building's bottom construction to be energy efficient.
工程师设计了这座建筑的底部构造，使其具有节能特性。
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2. The new road is builton the foundation of the old one,improving the bottom construction.
这条新路建立在旧路的基础上，提高了基础结构。
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3. The governmenthas invested heavily in the development of thecountry's bottom construction.
政府在该国基础结构的发展中投入了大量资金。