A train travels from a station to the next along a level track, it is necessary to finish the journey within a given time and to minimise the energy consumption.

火车沿水平轨道从一站运行到下一站，要求在给定的时间内完成该行程并使能耗最小。

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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

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This week, I got a phone call from a trainer at a low-level track with an 11-year-old ungelded horse in her barn.

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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.

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