在茫茫大洋深处，唯一可用的通信手段就是甚低频或者极低频无线电。
Out in the no-mans land of the international waters are the only means of communication with the submarines to use radio in the vlf or elf range.
UWB宽阔的频率范围包括了极低频率，美国海军将它用于与水中潜艇的通信。
UWB's broad frequency range includes the ultralow frequencies the U. s. Navy USES to communicate with submerged submarines.
UWB宽阔的频率范围包括了极低频率，美国海军将它用于与水中潜艇的通信。
UWB's broad frequency range includes the ultralow frequencies the U. s. Navy USES to communicate with submerged submarines.
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