luminiferous

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.

发型示牌的引方向固定不变，在复杂的火灾事故现场难于起到安全有效的示作用。