小心，三角形状的碎玻璃很锋利。

Be careful, the broken glass in the shape of triangle is very sharp.

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数学中最牢固的三角形状，在感情上恰恰是最脆弱的关系。

In mathematics, a triangular shape, the strongest in the emotional relationship is the most vulnerable.

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主体量和天窗在半山腰上，赋予项目三角形状的外观特点。

The principal volume and the skylights are triangles that stand out on the mountainside, giving the building its characteristic outline.

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So again, if we think about that shape of that carbon atom, it's going to be trigonal planar, 120° it's going to have bond angles of 120 degrees, because we have this set up of having three hybrid orbitals.

如果我们考虑碳原子的形状，它是平面三角形，键角是，因为我们有这三个杂化轨道。

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The shape is actually trigonal pyramidal.

它的形状是三角金字塔形。

麻省理工公开课 - 化学原理课程节选