You know, maybe in the tracks of an excavator or something like that.

也许在挖掘机的轨道上或者类似的地方。

I had an idea that we might get on the track of our American friend in their records.

我有一个想法， 我们可能会在他们的记录中找到我们美国朋友的踪迹。

He would be a good Middlemarch doctor, and by that very means keep himself in the track of far-reaching investigation.

他会成为一名优秀的米德尔马契医生， 并通过这种方式让自己始终处于影响深远的调查轨道上。