Many commands that text are made from an operator and a motion.
The format for a  follows:

      d   motion

Where:
  d      - is the delete operator.
  motion - is what the operator will operate on (listed below).

A short list of motions:
  w - until the start of the next word,EXCLUDING its first character.
  e - to the end of the current word,INCLUDING the last character.
  $- to the end of the line,INCLUDING the last character.

但是,我没有看到dw和de之间的区别.使用dw和de时的用例是什么？