1、How to choose appropriate unit vector to establish new inequalities.
如何選擇合適的單位向量來創(chuàng)建新的不等式。

2、Now, another useful notion is the unit vector to the trajectory.
還有一個(gè)有用的概念就是軌道的單位矢量。

3、It's the unit vector in the vertical direction.
即豎直方向的單位向量。

4、Suppose A itself is the unit vector in the y direction B Then A dot B is what?
假設(shè)A是y方向上的,單位矢量,則是z方向上的單位矢量。，and，B，is，the，unit，vector，in，the，z，direction。,那A點(diǎn)B是多少呢？

5、You'll see why very soon, in such a way that the derivative is this given unit vector u hat.
你很快就會(huì)明白為什么,導(dǎo)數(shù)dr/ds等于給定的單位u向量。

unit vector翻譯