overdraft on current account unsecured

例句：

1. 1.The bank will cover any overdraft charges for you.
   银行将为你支付任何透支费用。
2. 2.He made an overdraft on his credit card to pay for the purchase.
   他使用信用卡透支来支付购买。
3. 3.It's important to keep track of your overdraft and make sure it doesn't go into negative territory.
   保持对透支的跟踪很重要，确保它不会变成负数。