ㄑㄧㄢqiānㄌㄩˋshī

  1. 晏子春秋··》:聖人愚人一得。」聰明人雖然考慮周詳難免失誤地方·中文〉:嗚呼有備無患千慮一失聖人是以。」宋史··楊業·》:千慮一失。」千慮一得

reflect a thousand times and you can still make a mistake (idiom)​; to err is human
(expr. idiom.)​ l'erreur est humaine