That corresponds to normal vector pointing up.
那相当于法向量指向上。
The normal vector pointing up, here we know what it means.
法向量指向上，这里我们知道它是什么意思。
And, if you pay attention to the orientation conventions, you'll see that you need to take it with normal vector pointing up.
如果你注意到了方向的约定，你会发现它的法向量是向上的。
Begin turning counterclockwise and slowly bring the hoop up over your head, flipping it over your thumb as you shift your hand so the fingers are pointing up.
开始缓慢的逆时针旋转，把圈带到头顶上，移动手的时候在拇指上方迅速翻动呼啦圈，这样手指就是指向上方的。
"By using this effect to precess the spin from pointing up to pointing down, you can change the bit of information carried by that electron from a 1 to a 0, " Flatté says.
弗拉提说：「利用这种效应，把自旋从指向往上的状态进动到往下，你就可以把电子所带的资讯位元从1变成0。」
Drop-Knee :An exaggerated back-step where one knee is dropped toward the ground while the other is pointing up, resulting in a stable stemming position of the legs, especially on overhanging rock.
一只脚的膝盖朝下，另一只的朝上，使得双脚支撑得较好，尤其在悬岩的地方。
"Look," said Rabbit, pointing UP into the tree.
“看，”兔子说，并用手往上指着树。
"Look," said Rabbit, pointing UP into the tree.
“看，”兔子说，并用手往上指着树。
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