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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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