将得到原子更新的对象的类(在本例中是Book)。
The class of the object that will be updated atomically (in this case, Book).
对象出现在原子事实中的可能性，就是对象的形式。
The possibility of its occurrence in atomic facts is the form of the object.
对象出现在原子事实中的可能性，就是对象的形式。
The possibility of its occurrence in atomic facts is the form of the object.
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