通常，它通过保留对单个线程有效的一级缓存实例，维护它负责的映射实体类实例的可识别性或状态，从而做到这一点。

Generally, it does this by maintaining awareness or state of the mapped entity class instances it is responsible for by keeping a first-level cache of instances, valid for a single thread.

youdao

通常，它通过保留对单个线程有效的一级缓存实例，维护它负责的映射实体类实例的可识别性或状态，从而做到这一点。

Generally, it does this by maintaining awareness or state of the mapped entity class instances it is responsible for by keeping a first-level cache of instances, valid for a single thread.

youdao