If it's a stretch for you, I still recommend that you do it.

如果你觉得很勉强，我仍建议你一起来。

哈佛公开课 - 幸福课课程节选

This is going to be a little bit of a stretch for imagination, but imagination yourself as a Roman general, and let's figure out what you're going to do.

发挥你的想象力,想象你是一位罗马将军,我们来看看你应该怎么办

耶鲁公开课 - 博弈论课程节选

A section of DNA that is responsible for encoding a gene, let's say it's the insulin gene for example, might be some stretch of DNA on a certain chromosome inside your cells, inside the cells of the pancreas.

一段编码蛋白的DNA序列,我们就拿编码胰岛素的基因来举个例子,它也许是一段DNA基因序列,位于你胰腺细胞里的,某条染色体上

耶鲁公开课 - 生物医学工程探索课程节选