请再一次努力的看下立体图1，你可以看到水平方向上有反复的相似图案，这就是关键。
Please look hard at fig.1 once more, and you can find similar patterned repetitions in the horizontal direction. This is a key point.
请再一次努力的看下立体图1，你可以看到水平方向上有反复的相似图案，这就是关键。
Please look hard at fig.1 once more, and you can find similar patterned repetitions in the horizontal direction. This is a key point.
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