Moving forward is Yang; moving backward is Yin.

动作的前后有阴阳之分：动作向前为阳，动作向后为阴。

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This is great news, because when your ruler is moving backward, you often feel like nothing is clicking, on any score.

这是天大的好消息，因为当你的主星逆行时，你会感到诸事不利。

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But moving backward is more complicated, because internally the iterator performs a depth-first, preorder traversal of the Rope, visiting each of its leaf nodes.

但是向后移动要复杂些，因为迭代器内部执行的是深度优先算法，预先排好了Rope遍历的顺序，需要访问每个叶节点。

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The storyline would have to do some major backflips to keep moving forward, and these prequel games show that even moving backward is hard too.

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Our moving average looks backward eight years and (cheating a little) forward two.

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While the idea of moving forward and backward in-game with an analog stick on the side of a gun controller seemed unintuitive at first, its execution turned out to be practical.

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