由于节点结构只指向一个方向，所以它们完全不了解它们之前的节点的顺序。

Because node structures go in only one direction, they know nothing about the sequence of nodes that precede them.

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唐纳德栖息在附近的一棵树上，嘴巴指向尖顶的方向。

Donald perches on a nearby tree and the mouth pointed in the direction of the spire.

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冬天，地轴指向远离太阳的方向。

The axis is pointing away from the sun in winter.

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Now, if the current is sent one way through the read/write head the area is polarized in one direction.

如果当前通过读写头来发送指向一个方向的信息,这个区域的磁极指向某个方向。

哈佛公开课 - 计算机科学课程节选

If the current is sent in the opposite direction, the polarization is reversed.

如果当前发送一个相反的方向，磁极指向就反转。

哈佛公开课 - 计算机科学课程节选

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

耶鲁公开课 - 基础物理课程节选