在设置一个值后，键就从数据库中移除掉，并添加一条具有更新过的值的新记录。
Then when a value is set, the key is removed from the database and a new record is added with the updated value.
向该类添加具有恰当setter和getter方法的中介参数及记录引用，如清单5所示。
Add the mediation parameters with the appropriate "setters and getters" and logging references to the class, as shown in Listing 5.
他们将那些随意的、基于x86的计算机零件带回宿舍，将它们添加到托管具有传奇色彩的“爬网蛛”的Frankenstein机器上，爬网蛛—两次—记录下了斯坦福市的整个网络。
They'd bring these random x86-based computer parts back to their dorm room to add to the Frankenstein machine hosting the legendary rogue Web crawler that took down Stanford's entire network-twice.
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