在俯视图看上去,应该是同一方向的。
平行穿孔运行在同一方向的文件,通过新闻传播。
Parallel perforations run in the same direction that the paper travels through the press.
无需精心准备,无需刻意靠近,不是同一方向的追逐,爱情只是面对面的相遇。
Without careful preparation, without deliberately close to, not in the same direction of the chase, love is just face to face encounter.
So the minus vector is the same vector flipped over, pointing the opposite way.
因此负矢量即为同一矢量的翻转,指向相反的方向
Pick any two perpendicular directions Then the same entity, the same arrow which has an existence of its own, independent of axis, can be described by you and me using different numbers.
选取两个互相垂直的方向,这样同样的物体,同一矢量,并且是独立于坐标轴而存在的,可以被你和我用不同的数字来描述
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