乌焉成马[wū yān chéng mǎ]
词典When a book is copied thrice, some characters become alike.
词典printer's error：排版错误，印刷错误；乌焉成马。
词典printing mistakes owing to similar forms：乌焉成马。
乌焉成马[wū yān chéng mǎ]
\u0064\u0061\u006E\u0063\u0069\u002E\u0039\u0031\u0031\u0063\u0068\u0061\u002E\u0063\u006F\u006D
When a book is copied thrice, some characters become alike.; printer's error; printing mistakes owing to similar forms