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A broker is a person who signs a sales contract between a buyer and a seller and collects handling fees or commissions. From ancient times to the present, there has been no shortage of donors from all walks of life, playing a matchmaking role. There are brokers, intermediaries, technical service companies, consulting companies, bidding companies, and headhunters. . . Paradigm is not a broker, he is a serious electrical engineer and a corporate executive. He has always felt that brokers are very interesting. They hide their merits and reputations and wave their sleeves without taking away a single cloud. . . However, if there is a way back in life, some things and some people will have regrets regardless of their choices. . .