像一个小线索。

It's like a little clue.

youdao

大多数地面调查都需要走很多的路，寻找一些表面上的线索，比如陶器的小碎片。

Most ground surveys involve a lot of walking, looking for surface clues such as small fragments of pottery.

youdao

我常在妻子醒之前离开房间，把小礼物埋在庭院周围的各个地方，留下一点线索，引导着她发现一个又一个礼物。

I usually leave home before my wife is awake so I will plant different small presents around the house and yard with a clue leading her from one gift to the next.

youdao

It turned out there was no white van at all but in the first incident somebody saw a white van, this was reported in all the newspapers, then every other incident people started seeing the white van.

其实后来发现并没有白色小货车,但在第一起案件里有人看到白色小货车，所有报纸上都登了这条线索，结果在后来的案件中人们都看到白色小货车。

耶鲁公开课 - 心理学导论课程节选