a group of illnesses caused by a viral infection (usually restricted to a specific geographic area); fever and gastrointestinal symptoms are followed by capillary hemorrhage
30 to 300 megahertz
例句
用作名词(n.)
This radio station broadcasts only on VHF.这家电台只用甚高频广播。
These atmospheric conditions are playing merry hell with VHF reception tonight.这些大气环境在破坏今晚的甚高频的接收效果。
