说明如何透过资料服务存回实体资料的变更。

Shows how to save changes in entity data back to the database.

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银行从美联储借钱，再将借来的钱存回美联储，并从联邦基金利率和隔夜利率的利差中获利。

Banks borrow money from the fed, deposit it back into the fed, and profit from the differential between the federal-funds and overnight rates.

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然而，这个数据库抽象的好处是一个人能够创建任意可用数据库表的对象，处理它，并将之存回数据库。

However, the advantages of this database abstraction are ie. that one is able to create an object of any available database table, manipulate it, and store it back into the database.

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