当活期账户的余额为负数时，称为透支。
When the balance of a current account is negative, it is called overdraft.
他们还注意到DS：5表中的特定产品支持为负数。
They also noted that product specific support was negative in DS:5.
在我们的例子中，不允许有人拥有的支票帐户余额为负数。
In our case, we do not allow someone to have a negative checking account balance.
注：进出口差额负数为逆差。
注：进出口差额负数为逆差。
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