有些面料颜色零丁看不是很新奇，或者不是很美观，但将其与其它地面料组合搭配，就会使人发生新地颜色觉得。

Some lining color looked alone is not very novel, or is not very attractive, but its and other lining combination matching, will make one produce the new color sense.

youdao

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