N-COUNT 连环信(寄给数人，要求他们将信件复制后再寄给更多的人，往往承诺可以得到金钱回报) A chain letter is a letter, often with a promise of money, that is sent to several people who send copies on to several more people. Chain letters are illegal in some countries. 连环信(寄给数人，要求他们将信件复制后再寄给更多的人，往往承诺可以得到金钱回报)