Landlord, I suspect there is a clerical error in your riddle, so it is meaningless to say goodbye to the past twenty years. There is only one way, how to use it? This is the common sense of China people; And the word order of riddles is also one of the basic laws of riddles. If it is "farewell to the past twenty years", then the answer is easy to guess, and the answer is "Lei". Borrow words to forget the past, don't go to twenty, the word "thunder" has passed.