Mill er says U.S.missile defense capability is not as good as it should be in some areas, particularly the Middle East, but he expects that to change significantly,and soon.

VOA: standard.2010.03.26

You see a bleep going across the screen to indicate that they've got their finger on the pulse of what's happening, or you see it in TV shows like ER.

你们看到一个亮点在屏幕上来回跳动,来显示病人脉搏的,跳动情况,就像在急诊室的故事,这类电视中看到的那样

耶鲁公开课 - 生物医学工程探索课程节选

Here's the problem. How do I get to the nth- er, the k'th element in the list, in this case?

如何找到第n个元素呢-,在这里，如何找到第k个元素呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

At each point, er is a different vector pointing in the radial direction of length one.

矢量 er 在每一点处都不同,方向都从圆心指向该点,模长为1

耶鲁公开课 - 基础物理课程节选