Right, leading trips everywhere from 7 days to 78 days, and so it was an extended wilderness tracking program.

的确，我需要带领学生们远足，时间由7天到78天不等，这是一个长时间探寻野外的项目。

普林斯顿公开课 - 人性课程节选

Before Piaget, nobody noticed that babies had this problem tracking and understanding objects.

在皮亚杰之前,并没有人注意到婴儿在追踪和理解客体上,存在着守恒的问题

耶鲁公开课 - 心理学导论课程节选

And what did--what was he tracking?

他在录什么

耶鲁公开课 - 聆听音乐课程节选