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单词 valley fold
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双语版 TED-Ed 演讲精选

With peaks and valleys, folds and rifts, there are plenty of hiding places for a virus to stick.

手上高低交错的褶皱裂纹中,有许多能够让病毒附着的地方。

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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