very high frequency
英 美
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。
