A new theory based on uncertainty was introduced into the inspection and overhauling of monolithic track-bed.

将一种全新的基于不确定条件下的理论引入到无砟轨道混凝土整体道床的检测和大修中。

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Perched on his bed in his childhood room, surrounded by his track trophies and Phillies pennants, I realized that, once again, someone else knew more than I did.

蜷在他童年房间的床铺上，四面都是他的奖杯和费城人队三角锦旗，我再一次意识到，有人比我知道得更多。

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In fact, every patient that is carried into A Doll Hospital in Old Town Spring, Texas, gets a hospital-bed number to help track its treatment.

到德克萨斯斯普林老城这家玩偶医院就医的每位“病人”都能拿到一个医院病床号，以便对“治疗”效果进行跟踪调查。

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Craning our necks to see the front of our train nose out of a tunnel as the back of it enters, down below we spot the Trans-Canada Highway, laid on top of the original Big Hill track bed.

BBC: The wonders of Canada by rail

Mr. Han of Elmhurst, Queens, died when a southbound Q-train struck him as he tried unsuccessfully to climb out of the track bed.

WSJ: Man Pushed to Death in Front of New York City Subway Train