名词
中文翻译：无保护的金属结构
同义词：
['unprotected steel construction', 'unprotected iron construction']
例句：
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1. Thenew bridge is designed with unprotected metal construction to withstand heavy traffic.
这座新桥采用了无保护的金属结构设计，以承受重交通。
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2. The architect's design incorporates unprotected metal construction for durability and strength.
建筑师的设计中融入了无保护的金属构造，以增强耐用性和强度。
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3. The construction of the skyscraper was made with unprotected metal construction to ensure its longevity.
这座摩天大楼的建设采用了无保护的金属构造，以确保其持久性。