从可见光扩展到无线电波，再到X 射线和伽马射线，天文学总是会发现不寻常的物体，如射电星系、类星体和脉冲星。
The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.
描述：一种装置，转换声音成电子脉冲，允许利用无线电波直接对准身体(皮肤)的任何部分的方式传传递信息到大脑。
Description: a device that converts sound to electrical impulses; allowing information to be transmitted to the brain by means of radio waves directed at any part of the body (skin).
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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