If we add a mountain fold at this vertex, there are three valleys and two mountains.
如果我们在这个顶点加上一个山折,就是三个山谷和两个山峰。
单词 | mountain fold |
例句 |
原声例句
TED-Ed(视频版) If we add a mountain fold at this vertex, there are three valleys and two mountains. 如果我们在这个顶点加上一个山折,就是三个山谷和两个山峰。 TED-Ed(视频版) Unfold that sheet, and there's a pattern of lines, each of which represents a concave valley fold or a convex mountain fold. 展开那张纸,有一种线条图案,每条线代表一个凹谷折或凸山折。 TED-Ed(视频版) Second, the number of mountain and valley folds at any interior vertex must differ by exactly two— like the three valley folds and one mountain fold that meet here. 其次,任何内部顶点处的山折和谷折的数量必须恰好相差二——就像在这里相交的三个谷折和一个山折一样。 |
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