So banks are profiting off of police brutality in black and brown neighborhoods.
The plug-in hybrid and could tide Toyota over until the electric vehicle market becomes big enough to profit off of it.
请教老师，为何上面2个例句中在profit off后都出现了介词of ? 这个介词of怎么样剖析和理解？
off of 作为复合介词为非正式使用方法，在正式口语或写作中应该防止。在表示来源这个意思时，off作为介词也是非正式的。较为正式的用词为from.
你的句子中，profit off of sth/sb = profit off sth/sb = profit from sth/sb.
The Free Dictionar关于off of的使用方法说明：
UsageNote:Thecompoundprepositionoffofisgenerallyregardedasinformalandisbestavoidedinformalspeechandwriting:Hesteppedofftheplatform.Offisinformalaswellwhenusedtoindicateasource.FormalstylerequiresIborroweditfrommybrother.
