In this part, we'll cover how you can use an external systems model as part of the bottom-up track of the "meet-in-the-middle" approach.

在本部分中，我们将讲述如何将外部的系统模型作为“中间会合”方法的自底向上跟踪的一部分来使用。

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Fifty yards of track was blown up with dynamite.

50码长的轨道被炸药炸毁了。

《柯林斯英汉双解大词典》

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But he continues to stress the importance of law and order, and held up the election as an example of how things are starting to get on track.

VOA: standard.2010.03.07

This was when you had this big track, and if you have wandered around different Greek cities that are dug up, some of them will have the hippodrome there, and you can see how huge they were.

里面是大型赛道，如果你参观过发掘出土的希腊城市，有一些会有赛马场，非常宏伟巨大。

耶鲁公开课 - 新约课程节选

So we keep track of the types of questions that come up, unless I said something stupid in class or been confusing, certainly.

所以我们对出现的各种各样的问题保持联系，除非我在课程上说了一些愚蠢的,或令人困惑的话。

哈佛公开课 - 计算机科学课程节选

He took up track running as part of his rehabilitation, linking up with Louw.

CNN: Oscar Pistorius: The bullet in the chamber

Chambers' injury appeared less serious and his coach, Mike McFarlane, said he was recovering on the warm-up track.

BBC: Collins wins dramatic 100m

HS2 will free up track space on the Midland Main Line.

BBC: HS2: Minister defends route plan