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。