The spaceborne VLF/ELF loop antenna for the communications to submarines is a loop wire in the F-layer of the ionosphere at a height of 350 km.是什么意思_The spaceborne VLF/ELF loop antenna for the communications to submarines is a loop wire in the F-layer of the ionosphere at a height of 350 km.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句