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Third rail
01
第三轨, 为列车提供电力的附加轨道
an additional rail providing electric power to trains, often used in subway systems
Example
The subway train drew power from the third rail.
地铁列车从第三轨获取电力。
They installed a new third rail for the metro extension.
他们为地铁延伸安装了一条新的第三轨。
