用来传送数据的电磁能量可以是电子脉冲，也可以是无线电波或光线之类的辐射能量。
The electromagnetic energy employed to carry the data can be in the form of electric impulses or radiated energy in the form of either radio waves or light rays.
用来传送数据的电磁能量可以是电子脉冲，也可以是无线电波或光线之类的辐射能量。
The electromagnetic energy employed to carry the data can be in the form of electric impulses or radiated energy in the form of either radio waves or light rays.
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