在汇率波动幅度为 + / - 3%的情况下，今天各家银行美元兑越盾汇率上限为23854越盾，下限为22465越盾。
In the case of exchange rate fluctuations of +/-3%, the upper limit of the exchange rate of USD/VND for each bank today is VND 23854 and the lower limit is VND 22465.