求翻译：If you were unable to attend our on-campus book buy back, the online bookstore, ESCO, will be buying back used textbooks via mail. ,In addition to receiving a credit for your books, ESCO is also offering free shipping, for one week only. We encourage you to take advantage of this offer by logging in to your account at www.cshmbooks.com, and clicking on the tab "sell your books - returns" and follow the online directions.是什么意思？

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