Geometry dictates that only two -, three -, four - and six-fold rotational symmetry can exist.

几何规定旋转对称只能以二次，三次，四次和六次存在。

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RAID-Z traverses the available metadata to read only the data that's relevant for the geometry and avoids reading the unused space on the disk.

RAID - Z遍历可用的元数据以便只读取有关几何学的数据并避免读取磁盘上未使用的空间。

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You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.).

你可以使用初等的几何知识例如三角形的三个内角各为180度和三角形全等的规则(边-角-边等)。

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We have two lone pairs, so if we thought about what the bonds were everywhere, 5° it would be 109 . 5, but it's bent because we're only looking at the bonds, we're not counting the Lewis structures in naming our geometry, but they do affect the angles.

我们有两个孤对，所以如果我们考虑它会成怎样的键时，应该成109。,但它是折线型，因为我们只考虑成键，在几何形状里不考虑Lewis结构，但它会影响角度。

麻省理工公开课 - 化学原理课程节选

Geometry dictates that only two-, three-, four- and sixfold rotational symmetry can exist.

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Although Riemann, who died at the age of only 39, also laid the foundations in geometry for Einstein's general theory of relativity, his paper on prime sattracted little attention in the decades after it was first published.

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