Then I'll take money out of your cash account and I'll put it into these securities.

买的话我就从你的账户中取现,再存入证券账户中

耶鲁公开课 - 金融市场课程节选

There are two things: you can have a cash account with them you put money into the cash account and you haven't bought shares with it yet; it's just sitting--it's like in a bank.

这里有两种情况,一种是你有现金账户,你将钱存进现金账户,但还没有买股票,仅仅是做储蓄,就像存在银行

耶鲁公开课 - 金融市场课程节选