名词
中文翻译：活动栏杆
同义词：
['moving part', 'moving part of a machine']
例句：
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1.The moving rails on the train are designed to keep passengers safe.
火车上的移动栏杆设计用来确保乘客的安全。
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2. The moving rails on the bridge were made from steel.
这座桥上的移动栏杆是用钢制成的。
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3.The engineer carefully adjusted the moving rails to ensure smooth operation.
工程师仔细调整了移动栏杆，以确保操作顺畅。