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
全有效的疏散指示作用。
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What Michelson and Morley did, without actually intending to, was undermine a long-standing belief in something called the luminiferous ether, a stable, invisible, weightless, frictionless, and unfortunately wholly imaginary medium that was thought to permeate the universe.
迈克尔逊和莫
所
的, 实际上并没有打
这样
,而是破坏了

一种叫
发光以太的东西的长期信念,这是一种稳定的、不可见的、无重量的、无摩擦的,不幸的是,它完全是虚构的介质, 被认为渗透到宇宙中。