单词：lead rail
lead rail的用法和样例：
例句
- Each column is equipped in both planes with a preloaded roller bearing guide rail.每个立柱的两个平面均配有预加载滚柱轴承导轨。
- The welding carriage is adapted to the rails of various diameters,but each rail is adapted to the certain diameter pipe only.焊接小车可适应各种直径的导轨，但每一种导轨只能适应一定的管道管径范围。
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