词频词典用英文怎么说

词频词典的英文：
word frequency dictionary

• 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。

• 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。

• Their dictionary was printed last month.
  他们的字典已于上个月出版发行。
• The new dictionary is going well.
  这部新词典销路很好。
• He is as it were a walking dictionary.
  他可说是个活字典。