这种通迅联系要靠21厘料波段，即每秒1420兆周的精确无线电频率。
This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second.
计算机的速度通常用每秒(行)(钟)期来表示。典型的机器运转在100到200兆赫或者说每秒100到200兆周期。
The speed of a computer is usually expressed in cycles per second. Typical machines operate at100 to200 megahertz or100 million to200 million cycles per second.
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