It is a truth universally acknowledged that radio-frequency spectrum is scarce in the U.S.
It is a truth universally acknowledged that radio-frequency spectrum is scarce in the U.S.
在美国，无线电的频谱不足是公认的事实。
It is a truth universally acknowledged that radio-frequency spectrum is scarce in the U.S.
在美国，无线电的频谱不足是公认的事实。