求翻译：电磁波不需要依靠介质传播，各种电磁波在真空中速率固定，速度为光速。在自由空间内，电磁波不只是有以光速传播的性质，电磁波的电场部分和磁场部分有特定的相对定向、相对大小。它们之间的相位一样。是什么意思？

The electromagnetic waves do not need to rely on media dissemination, the fixed-rate variety of electromagnetic waves in a vacuum, the speed of the speed of light. In free space, the electromagnetic waves not only to the nature of the speed of light propagation, the electric field of the electromagn

Electromagnetic waves do not need to rely on media communications, and electromagnetic waves in a vacuum of fixed rate, the speed of light. In the free space of electromagnetic waves, is not only a nature at the speed of the electric field of the electromagnetic wave part, and some have a specific m

The electromagnetic wave does not need to depend upon the medium dissemination, each kind of electromagnetic wave the speed is fixed in the vacuum, the speed is a speed of light.Not only in the free space, the electromagnetic wave has by the speed of light dissemination nature, the electromagnetic w

Electromagnetic wave dissemination need not rely on media, all kinds of electromagnetic waves in vacuum rate fixed, speed is the speed of light. In free space, the nature not only at the speed of transmission of electromagnetic waves, electromagnetic waves the electric field and magnetic field compo

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