But this method occupies the special sub-carriers or time slots and then reduces the system spectrum efficiency and data transmission rate.

但该方法占用专门的子载波或时隙，降低了系统的频谱利用率和信息传输速率。

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Marconi was the first to develop and perfect this system, using the recently discovered "airwaves" that make up the electromagnetic spectrum.

马可尼是第一个开发和完善这一系统的人，他使用了最近发现的构成电磁谱仪的“空气波”。

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If you have a binary system whereby both stars are visible so you get the spectrum of both stars, then you see the Doppler shift of both stars in the spectrum.

若存在一个双星系统，两颗恒星均看不见，你能得到双星的光谱，然后在光谱中看到，双星的多普勒顿移。

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Spectrum comes in different shapes and sizes (well, different frequencies and bandwidths, to be precise) and a machine system needs spectrum with very particular characteristics.

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Son successfully built a system in Japan using that same spectrum position.

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