名词
中文翻译：无防护的法兰通道
同义词：
['unprotected flange', 'unsealed flange']
例句：
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1.The engineers had to install a new unguarded flange in the factory.
工程师们不得不在工厂安装一个新的无防护的法兰。
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2. The construction crew was working on an unguarded flange that needed to be replaced.
建筑工人正在修理一个需要更换的无防护的法兰。
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3.The new design of the machine uses an unguarded flange for better efficiency.
新型机器的设计使用了无防护的法兰以提高效率。