N a radio-frequency band or radio frequency lying between 30 and 300 megahertz 甚高频 ( abbr: VHF)
Ultrasound is used by many animals that detect and some of them send out very high frequency sounds.
许多动物都用超声波来进行侦查,有些动物还能发出非常高频的声音。
Can you hear it? Very high frequency.
能听到吗?,很高的频率。
I have here a tuning fork which generates 4,000 Hertz, a very high frequency.
这个音叉,产生4000的赫兹,一个很高的频率。
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