The performances are studied by means of heat expansion testing, intension testing and visible light transmission testing and so on.
应用热膨胀测试、抗折强度测试和可见光透过率测试分析了微晶玻璃的性能。
Radio is the wireless transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light.
一种在可见光下以一定频率在空间穿行的电磁无线信号，请注意是“可见光”，下面会提到这个概念。
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