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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。

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For example, the high frequency word "rain" is very common and can be found in a number of important expressions.

例如，高频词“rain”很常见，可以在一些重要表达中找到。

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Gallium Arsenide and Gallium Nitride are preferred for LEDs, certain photovoltaics, and some very high frequency radio applications.

FORBES: Why Use Silicon?

"Tiny goldcrests, one of our smallest birds, rattled out a shimmering song of a very high frequency that sounded like an out of control sewing machine, " says Chris.

BBC: Llandegla Forest and the black grouse love dance

These leads will have to be sufficiently short to transmit very high frequency signals, which tend to radiate away as microwaves if the lead is too long (by 2015, chips will work high in the gigahertz band).

ECONOMIST: MONITOR