有两种情况:新用户或返回的用户。
有两种情况需要交换生成的类。
There are two cases where the exchange of generated classes is required.
所以右边为零时,有两种情况。
So, in that case, if the right hand side is zero, there's two cases.
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
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