柯林斯英汉双解大词典
third rail
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1.
N-COUNT The third rail on a railway track is the steel bar which passes electric current to a train. (铁路轨道)第三轨; 输电轨
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2.
N-SING If you refer to something as the third rail of a political situation, you mean that it would be dangerous to make changes to that thing because people feel very strongly about it. (政治上的)险局 [美国英语] ['the' N]
例：Politicians speak of Social Security as the third rail. To touch it is to commit political suicide.
社保对政客们来说是个高危带电的话题，碰它就等于政治自杀。
双语例句权威例句
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In some cities, a third rail provides power to a subway train, usually operating underground; electricity passes through the rail.
在一些城市，第三道铁轨(电动机车的输电轨)给通常在地下运行的地铁列车供电，电力通过这道铁轨传输。
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That is a slightly lower proportion than in Greece or Sweden, but far higher than in America, where raising fuel taxes is nonetheless said to be a "third rail", deadly to politicians.
比希腊和瑞典低一些，但是远远的高于美国。在美国，提高燃油税就像是第三铁道，对于政客来说是致命的。
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It was private land, dissected by the driveways, the buck-and-rail fences, the arched gateways of people wealthy enough to have a second home, or a third, on the headwaters of the Green.
这是位于绿河源头的私人土地。那些有能力拥有第二或第三个家的有钱人用车道、架子横杆围栏，和拱形通道将这里划分成几部分。
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