They took a crystal, this is a single crystal of nickel that has regular planes of atoms, and those planes are spaced on the order of an angstrom or less apart, and they irradiated this with x-rays.

他们取了个晶体,一个具有规则原子平面的，镍晶体,这些面间距差不多也是一埃或者更少，它们放射出X射线。

麻省理工公开课 - 固态化学导论课程节选

In the second mode of working, the crystal fibre uses the regular array of holes to influence light in much the same way as the arrangement of atoms in a crystal can determine whether electrons are able to travel easily through it and hence whether the crystal is electrically conducting or not.

ECONOMIST: A new approach to making optical fibres

Phonics teaching is an important component of the teaching of reading, but not all words in English are phonically regular (the linguist David Crystal estimates 80% are, but the other 20% contains many of the most common words in English).

BBC: Viewpoints: Teaching children to read

Quartz watches use very high-frequency oscillations of a crystal, which can be tuned with extreme precision to produce regular signals.

ECONOMIST: A luxury watchmaker is putting silicon in its timepieces