The carbon atoms in a diamond form "3-D" bonds with their neighbors, resulting in a sturdy, pyramidlike, repeating crystalline structure.

钻石中的碳原子同它们的相邻原子形成“三维的”化学键，形成了一个坚固的、金字塔般的重复性晶体结构。

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The application of diamond has always been a major R & D target in abrasives industry.

在磨料磨具行业中，超硬材料金刚石的应用一直是行业研究、关注的问题。

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Diamond grinding wheel dressed with D cup wheel or diamond powder sintered bar could be used for finish grinding;

单用D杯型砂轮或金刚石微粉烧结棒法修整后的碟形金刚石砂轮适用于精密磨削；

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it's something that is still going on. We have got cases of conflict diamonds in Cote d'Ivoire in West Africa and also in Zimbabwe where hundreds of people were murdered in the Marange diamond fields recently."

VOA: standard.2010.08.05

It is accented with a 3-carat, D color diamond clasp signed by Cartier.

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The band, which also featured Michael "Mike D" Diamond and Adam "Adrock" Horovitz, sold more than 40 million records and had four No.1 records.

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Leading the way was a pear-shaped D color flawless diamond of 50.52 cts.

FORBES: 50-Carat Diamond Sells For $9.5 Million