单词：vhf 

名词

• 
  [1.n.vhf] (同义词:[hemorrhagic_fever]  [haemorrhagic_fever]  [viral_hemorrhagic_fever]  [viral_haemorrhagic_fever]  [VHF(abbr.Very High Frequency 甚高频 n. 甚高频,特高频 )]  )
• 
  注释列句：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
• 上位词 -> [viral_infection]  [infection( n. [医] 传染, 传染病, 影响, 感染 )]  [ill_health(n.不健康 )]  [pathological_state]  [physical_condition(物理［物质］状态 )]  [condition( n. 条件, 情形, 环境, 社会地位 vt. 以...为条件, 使达到要求的情况 )]  [state( n. 情形, 状态, 国家, 政府, 州 adj. 国家的, 国有的, 国营的, 州的, 正式的, 典礼用的 vt. 声明, 陈述, 规定 )]  [attribute( n. 属性, 品质, 特征, 加于, 归结于 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )] 
• 下位词 -> [Argentine_hemorrhagic_fever]  [Ebola_hemorrhagic_fever]  [Lassa_fever(n. 〈医〉拉沙热 )]  [Crimea-Congo_hemorrhagic_fever]  [Rift_Valley_fever]  [Marburg_disease] 
  
• 
  [2.n.vhf] (同义词:[very_high_frequency(n.[无]特高频率(=VHF) )]  [VHF(abbr.Very High Frequency 甚高频 n. 甚高频,特高频 )]  )
• 
  注释列句：30 to 300 megahertz
• 上位词 -> [radio_frequency(n.无线电频率 )]  [frequency( n. 频率, 周率, 发生次数 )]  [rate( n. 比率, 速度, 等级, 价格, 费用 vt. 估价, 认为, 鉴定等级, 责骂 vi. 被评价, 责骂 )]  [magnitude_relation]  [relation( n. 关系, 联系, 叙述, 故事, 亲戚 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )] 
• 部分总称 -> [electromagnetic_spectrum(电磁波频谱 )] 
  所有总称 -> [electromagnetic_spectrum(电磁波频谱 )]