美国总统唐纳德‧特朗普任命伊隆‧马斯克，成为一个组织的领军，去削减政府开支，这一决定带来了极多的诉讼（plethora of ...

See? “By” originally means “bye” or byway. That’s why, in fact, some people still spell “by the by” as “by the bye”. By the way, “that is by the by or bye” in this sense (secondary) is an idiom that ...