The method throws an OutOfStockException when no books are available with that title and author or a InsufficientCreditException if the customer has no sufficient funds to pay for the book.

当不存在与title和author匹配的书籍时，该方法抛出Out Of StockException，或者当客户没有足够资金为书籍付款的情况下，该方法抛出InsufficientCreditException。

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If a has sufficient funds on hand, money is subtracted from one account and added to another account.

如果手头的资金充足，则从一个账户中减去资金，并添加到另一个账户中。

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Submit official bank statement(s) indicating that the student has sufficient funds to support study abroad.

提交可以证明学生有足够资金可在国外学习的正式银行存款证明。

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They further infer that regulation has not been sufficient to ensure that fees reflect the value that funds create for investors.

FORBES: Na?ve Investors Taken to the Cleaners