Now, how do we get this unit vector?
那我们怎么得到这单位矢量呢？
它不是单位向量。
It's the unit vector in the vertical direction.
即竖直方向的单位向量。
So, that means this actually should be the unit vector.
这意味着这一项就是单位向量。
How to choose appropriate unit vector to establish new inequalities.
如何选择合适的单位向量来创建新的不等式。
How to choose appropriate unit vector to establish new inequalities.
如何选择合适的单位向量来创建新的不等式。
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