RR：凸起钢轨

“Raised Rail” 常缩写为 RR，这一简写形式便于快速记录和日常使用。该术语多见于铁路运输及相关工程领域，特指一种高出地面或基座的钢轨铺设方式，其中文含义为“凸起钢轨”。这种结构设计有助于提升线路的稳定性，常见于特殊路段或道口铺设场景中。

According to the beneficial influence of superelevation to the flatcar bottom raised from rail surface, it is advised that the suitable superelevation ( 20-30 ) mm is necessary in the minimum radius curve negotiation.
根据超高对车底轨面高度抬高的有利影响，建议在最小半径曲线通过时应当有适当的超高量（20-30）mm。
Development of the situation raised new requirements on rail transport, as the continuous development of modern railway technology.
现代铁路技术的不断发展，对铁路运输专业教学提出了新的要求。
China has blamed rampant mismanagement in its railway industry for a train collision that killed 40 people and raised doubts about its high-speed rail system.
中国已将一起导致40人死亡的列车追尾事故归咎于铁路行业普遍管理不善。这起事故令人对中国的高速铁路网络产生疑虑。
China's rail industry was dealt a major setback a year ago, when a deadly high-speed train collision near the eastern city of Wenzhou raised questions about whether the country's rail ambitions were moving too fast.
一年前，中国铁路行业遭受了严重打击。当时，温州附近发生特大高速铁路撞车事故，引发外界质疑中国在铁路项目上的雄心是否膨胀得过快了。

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