"I've looked at this picture very often but I'd never really noticed this shadow before," he suddenly said, pointing to a patch of burnt umber near the elbow.

“这张画我看过好多次，但从没注意过这一块阴影。”他突然说，并指出画中手肘处的一块棕色焦痕。

youdao

This is a picture of patch clamp, it's a device that engineers built to fasten onto individual cells in order to look at how molecules in the membrane of the cell are working, and I'll talk a little bit about that as we go along.

这是膜片钳的图片,工程师使用该装置固定单个细胞,由此观察,细胞膜中的分子怎样活动,在以后的课中我还会谈到这方面内容

耶鲁公开课 - 生物医学工程探索课程节选