The cheapest way to increase capacity is to add more spectrum or to move a network to a lower frequency, which allows radio waves to penetrate walls more easily.
提高带宽容量最便宜的方法是增加更多频谱或是某个网络降低到更低的频率以使无线电波更容易穿透墙壁。
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They suggest that any alien civilisation worth its salt would alight not on the photons of the electromagnetic spectrum-whether optical or radio-frequency-to send messages to other solar systems.