The point groups of octagonal system in quasicrystal are studied.

从理论上对准晶体中八方晶系各点群进行了研究。

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The point groups of the crystals at room temperature were determined by means of X-ray diffraction and ferroelectric measurement.

根据x光衍射及铁电测量，确定了在室温时晶体的点群。

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Four-dimensional point groups are deduced by generating normal three-dimensional point groups with certain restrictions which are unique for modulated structures.

在某些限制下，推广三维点群的概念，导出四维空间点群。

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Premier Wen also said the Chinese government works for the equality of all ethnic groups, a point disputed by China's Tibetan and Uighur dissidents,among others.

VOA: standard.2009.11.07

And often in response people who want to foster more positive views will often try to--will often put in representatives from other groups in unusual ways to make that point.

为了反击这种刻板印象,想形成一个积极观点的人,通常都会…,引进其他群体的成员,以不同寻常的方式来证明他们的观点。

耶鲁公开课 - 心理学导论课程节选

The best that evolutionary biologists can do is usually to point to groups of species that have plainly diversified recently, usually on a group of islands.

WSJ: Matt Ridley on the Possible Formation of a Species | Mind & Matter

Fitzpatrick also did not resort to attack ads, at one point asking national groups to stop running negative ads.

CNN: Fitzpatrick to claim open seat in Penn.

Those groups point out that one of the biggest aims of pay-as-you-drive programs is simply to capture actual miles driven.

FORBES: Drivers Accept Monitoring Devices, To Earn Discounts on Auto Insurance