An investment bank is not a bank that accepts deposits; it doesn't deal with the general public.

投资银行不开设存款业务,也不面向大众提供服务

耶鲁公开课 - 金融市场课程节选

Most mutual funds are providing some diversification service and they're also trying to beat the market.

大多数共同基金不仅提供分散投资服务,同时他们也试图获利

耶鲁公开课 - 金融市场课程节选