词频的英语怎么说

词频的英文：
word frequency

There is an
在apple这个词中有一个字母A。

This is a derivative word.
这是一个衍生词。

This is an informal word.
这是一种口语用语。

Bitter words and good acupuncture—to advise with faithful words.
苦语针砭。

The German word `Haus' is cognate with the English word `house'.
德语的haus一词和英语的house一词同源.

W is the radian frequency deviation from the center frequency
△W是角频率与中心频率的偏离值。

The frequency inverters has a function of variable voltage and variable frequency.
频率逆变器具有变压、变频功能。

Accidents are happening with increasing frequency.
事故发生得越来越频繁。

He varied the transmission frequency.
他变换了无线电传送的频率。

There will be no amplification of radiation at the frequency ??
在频率?舜Φ姆?射将不会有任何增强。