additive to extraction的用法和样例：
- He tried to extract his pole from the mud.
- It take a major operation to extract money from a minor poet.
- Why are matches of subgroups important?The main reason is that there are times where you want to extract the patterns you match, in addition to making a match.
- Ann will be a very useful addition to our team.
- Wood ashes are leached to extract lye.