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。

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Now that you know your fitness level, keep track of your progress.

现在你已经知道了你的健康水平，保持跟踪你的健身进度。

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There's a lot of engineering that we've already talked about in terms of producing quantities of the vaccine, producing it reliably, producing it safe, distributing it, and keeping track requires a level of sophistication that maybe you wouldn't have thought about initially.

我们已经讲过很多工程方面的内容,比如大批量制造疫苗,制造可靠的疫苗,制造安全的疫苗,分派发放疫苗,以及一个完善的随访监测系统,你们最早可能没有想过这些冬夜

耶鲁公开课 - 生物医学工程探索课程节选

Perhaps more importantly, a significant reaction does register in iTunes sales data, both on the album and track level.

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Schools track your level of interest, so attending an information session or campus tour can help.

FORBES

Passengers were eventually allowed to climb down a ladder and walk along the track to a level crossing.

BBC: East Coast rail line disrupted by signal failure