Vlf
甚低频
🗣️ 情景例句
There has been very little progress this term.
这学期没有什么进步。
Thank you for your help.
谢谢您的帮助。
Professor Ronald Bracewell, a leading American radio astronomer,argued in Nature that such a superior civilization, on a visit to our own solar system,
假如有如此高级文明生命访问了我们的太阳系，