Now they've been found in something that bumps and grinds, visible with nothing fancier than a high school lab-issue microscope.

目前它们被发现在一些碰撞和研磨中产生，可见程度无非是高中实验室显微镜的水平。

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Sometimes the individual crystals, with plane faces and sharp edges and comers, visible to are the naked eye, and sometimes they can be seen only under a microscope.

单晶有时用肉眼就能看得到，有时只有在显微镜下才能看得见，这种单晶有着平的晶面和锐利的棱角。

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Sometimes the individual crystals, with plane faces and sharp edges and corners, are visible to the naked eye, and sometimes they can be seen only under a microscope.

单晶有时用肉眼就能看得到，有时只要在显微镜下才能看得见，这种单晶有着平的晶面和锐利的棱角。

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Having found one, it grows into a spat, which when seen beneath a microscope already resembles a tiny oyster, with the shape of a shell already visible.

ECONOMIST: A dozen ocean-cleaners and a pint of Guinness, please