名词
中文翻译：Unknown
同义词：
['standard rail', 'standard track', 'standard fence']
例句：
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1.The construction workers were busy installing the standard-length rails for the new bridge.
建筑工人正在忙着安装新桥的标准长度栏杆。
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2. The train was delayed due tothe standard-length rails being toolong.
火车因为标准长度的栏杆太长而延误了。
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3. The security guard used thestandard-length rail to keep an eyeon the crowd.
保安用标准长度的栏杆来监视人群。