Then the back charged you a S20 fee for overdrawing your account.

银行就因为你在帐户上透支，收了你20美元的费用。

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You may not even know if this is happening; your bank will not notify you when you make your purchase that you are overdrawing your account.

你可能甚至不知道，如果这种情况发生；你的银行不会通知你，当你使你购买你透支你的账户。

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Clients' transactions will be stopped only in the circumstance of serious overdrawing of the accounts, that is to say, transactions at this type of account have strict restrictions.

客户的交易只有在帐户严重透支的情况下会被停止交易，因此在该类型账户上进行交易时有比较严格的限制。

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Citibank offers free e-mail and wireless alerts if you get near to overdrawing your account.

FORBES: Don't Get Fleeced By Overdraft Fees

Bank of America announced on Wednesday that it plans to deny any debit-card transaction that will result in a customer overdrawing his account.

FORBES: Bank of America's New Overdraft Policy: What It Means To You

One way to avoid overdrawing your account is to sign up for e-mail or mobile text alerts from your bank to notify you of a low account balance.

FORBES: Banking