Tweedledum and Tweedledee
/ˌtwiːdlˈdʌmənˌtwiːdlˈdiː/noun
- a pair of people or things that are virtually indistinguishable难以区分的两个人（或物）。
词源
originally names applied to the composers Bononcini （1670-1747） and Handel, in a 1725 satire by John Byrom （1692-1763）; they were later used for two identical characters in Lewis Carroll's Through the Looking Glass.