bring
to take something or someone with you to the place where you are now, or to the place you are talking about
bring in
1 to introduce a new law:
Harsh anti-Trade Union laws were brought in in the early 1980s.
2 to ask someone to become involved in a discussion or situation:
I'd like to bring in Doctor Hall here and ask him his views.
bring somebody in to do something
The police were brought in to investigate the matter.
3 to earn a particular amount or produce a particular amount of profit:
The sale of the house only brought in about £45,000.
4 to attract customers to a shop or business:
We've got to bring in more business if we want the restaurant to survive.
5 bring in a verdictSCL to say officially in a law court whether someone is guilty or not guilty of a crime [= return a verdict]:
The jury brought in a verdict of not guilty.
参考资料:Longman Dictionary of Contemporay English