You guys have also seen vectors, I'm pretty sure, but it is worth going over some properties and some may be new and some may be old.

我很肯定你们曾接触过矢量,但复习一下相关的性质是很有必要的,有些可能是新知识,有些是已经学过的

耶鲁公开课 - 基础物理课程节选

WNYC is excellent. WBGO in New Jersey, it's pretty good, the jazz station.

NYC很不错。新泽西的WBGO爵士台也挺好。

纽约的媒体 - SpeakingMax英语口语达人