Luminiferous gem is the man made modern night shining jewel developed with modern technology by research workers and caused strong echo in gemstone circle.
宝石是近期由我国的科学工作者依靠现代科学技术研制出的“现代夜明珠”,在宝石界引
。
的,传的Luminiferous gem is the man made modern night shining jewel developed with modern technology by research workers and caused strong echo in gemstone circle.
宝石是近期由我国的科学工作者依靠现代科学技术研制出的“现代夜明珠”,在宝石界引。
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.
型疏散指示牌的指引方向固定不变，在复杂的火灾事故现场难于到安全有效的疏散指示作用。
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