The "stauroscope", an optical instrument for studying the crystal structure of minerals under polarized light, is also no longer used.
一种用来研究偏振光下矿物的晶体结构的光学仪器，也不再被使用。
The "stauroscope", an optical instrument for studying the crystal structure of minerals under polarized light, is also no longer used.
一种用来研究偏振光下矿物的晶体结构的光学仪器，也不再被使用。
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