1 used especially with a passive verb to say who or what does something or makes something happen 被,由〔尤与被动语态动词连用〕
WHO/WHAT DOES STH
由谁/什么做某事
著名建筑师克里斯托弗.雷恩设计的一座教堂
23 23. used when mentioning something that may be interesting but is not particularly important [口]
顺便说一下 spoken
by the by