third rail
短语n. 电动机车的输电轨（借以供给动力）, 烈酒
词形变化
third rails
复数
third rails
释义与例句
n.
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1.
The electrified rail that runs beside or between train tracks to power electric trains.
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2.
Anything that is controversial or dangerous to come into contact with, or is best avoided.
引申义