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.

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检查帐户余额。

Check the account balance.

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我们预计这个操作会返回多个值，比如帐户余额和用户姓名。

We expect the operation to return multiple values, namely the account balance and owner's name.

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