根据盖利森的意见，光可以通过不同的介质运行，如在通过冷冻的纳气时，光的速度实质上变慢了。 然而这是因为光线在运行介质里的原子之间时，会反复地反弹。
Light traveling through different mediums, such as chilled sodium gas, does slow substantially, but this is because the light is being bounced between the atoms within the medium.
根据辐射在介质中的传输是按指数规律衰减的波盖耳定律和实际测试情况，提出了规范的消光系数测试步骤和计算方法。
In terms of the transmission of the radiation at the mediums, which following the Bougver laws of the index rules attenuation and the realistic measure…
阀体与盖被中间隔膜隔开，使得隔膜上方的阀盖，阀杆等零件不受介质侵蚀；
Valve body and bonnet are separated by diaphragms in order to prevent valve parts, such as bonnets and steam from corrasion;
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