Freezing mud that reached track level could derail a train, and rock salt kept the mud soft.
铁轨周围结冰的泥土会造成火车脱轨，岩盐可以使泥土保持松软。
A consumer probably wouldn't want to attend a rock concert or stand next to a passing train to charge their cell phone.
消费者可能不想参加一场摇滚音乐会，或者站在过往车辆的旁边来为他们的手机充电。
The Potomac Eagle train, passing Eagle Rock along the south branch of the Potomac River near Romney, W. Va.
波多马克鹰列车，沿西弗吉尼亚州罗姆尼的波托马克河南支线，通过鹰岩。
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