The discussion of Listing 2 points out an unusual construct: Person_.age, which is a designation for the persistent age attribute of Person.
讨论清单2时指出了一个不常见的构造：Person _ . age，它表示Person的持久化属性age。
The discussion of Listing 2 points out an unusual construct: Person_.age, which is a designation for the persistent age attribute of Person.
讨论清单2时指出了一个不常见的构造：Person _ . age，它表示Person的持久化属性age。
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