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。