ˋshìㄧㄡˊyóu

  1. 事情原委來由·感時破除生死穹蒼問事。」拍案驚奇·》:不知家老兒不問事由。」

main content, matter, work, origin of an incident, cause, purpose, subject (of business letter)​
le contenu principal, matière, travail, origine, cause, but, sujet