We find the reduced fidelity is an effective tool in detecting the quantum phase transitions associated with level crossings for the finite-size systems.

我们发现在有能级交叉的有限大尺寸系统中，约化保真度是一个测量量子相变的有效工具。

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Network Rail said the surest way to prevent any accidents was to close level crossings.

BBC: Level crossings: Wales safety work after 33 near misses

Last year, Network Rail released footage in Llanelli to highlight the potential dangers of level crossings.

BBC: Warnings over level crossing 'madness' in Wales

Hundreds of motorists are continuing to risk their lives at train level crossings, Network Rail has warned.

BBC: Warnings over level crossing 'madness' in Wales