它们身后留下了一条长长的痕迹，你也许可以说这是它们从一个位置移动到另一个位置的轨迹。

They leave long trails behind them, tracks you might say as they move from one point to another.

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电子支付公司 CreditCall 的首席技术官、支付安全专家杰里米·冈布利解释说：“每个磁条都有三条信息轨迹。”

"Each magstripe has three tracks of information," explains payments security expert Jeremy Gumbley, the chief technology officer of CreditCall, an electronic-payments company.

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经过彻底的调查，许多专家现在认为，这条轨迹是一条普通的喷气式飞机尾迹。

After a thorough investigation, many experts now believe that the streak was a run-of-the-mill jet aircraft contrail.

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It's about thinking what would make the right ending to this intellectual trajectory, this intellectual narrative that we're going to move through this term: what would make the right ending.

还要思考，这条知识轨迹在哪里终结才合适,连起这学期的知识性讲述,怎么才能恰到好处的结尾。

耶鲁公开课 - 1945年后的美国小说课程节选