Luminiferous gem is the man made modern night shining jewel developed with modern technology by research workers and caused strong echo in gemstone circle.
发光宝石是近期由我国的工作者依靠现代术研制出的“现代夜明珠”,宝石界引起强烈响。
Luminiferous gem is the man made modern night shining jewel developed with modern technology by research workers and caused strong echo in gemstone circle.
发光宝石是近期由我国的工作者依靠现代术研制出的“现代夜明珠”,宝石界引起强烈响。
The direction of luminiferous evacuation indicator is fixed in complex fire accident scene,that is difficult to play safe and effective role in the evacuation instructions.
发光型疏散指示牌的指引方向固定不变,的火灾事故现场难于起到安全有效的疏散指示作用。
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