在开始设计之前，建筑师在客户原来的房子待了一段时间，观察他们的生活，研究他们的习惯。

Prior to beginning his design, the architect spent some time in the client's old home, observing their life and studying their habits.

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观察敏锐的步行者可能在这一路段看到赤鹿。

Observant walkers may see red deer along this stretch of the road.

《牛津词典》

Zack 和同事们结合了两个时间段的研究结果，以评估所观察的精神苦恼发病在地理上的模式。

Zack and his colleagues combined survey results from the two periods to assess geographic patterns in perceived mental distress.

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It's also going to be the process of watching an artistic form unfold over a very exciting period of time.

更是一个观察某种艺术形式在一段,刺激的时间里展现的过程。

耶鲁公开课 - 1945年后的美国小说课程节选

There's a lag period where if I was just looking for antibodies nothing happens for a while.

这中间存在一段迟滞期,如果只过一会就进行观察,抗体的数量不会发生变化

耶鲁公开课 - 生物医学工程探索课程节选

Well, the first thing that I noticed, they have been going wrong for a while.

据我观察，首先，这种状态其实已经持续了一段时间了。

普林斯顿公开课 - 国际座谈会课程节选