在永久性上下文中，实体实例及其生命周期得到管理。
Within the persistence context, the entity instances and their lifecycles are managed.
核心实体实例的生命周期单独定义了在正常操作中系统最有可能处理的东西。
Instances of the core entity lifecycles alone define what the system will most likely process during normal operations.
比如说，在“一对多”关系的多的一端，实体实例最少和最多是多少，有没有限制；
What are the minimum and maximum number of records that can exist on the many side of a one-to-many relationship?
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