primary retention 子体原子在核转变过程中获得的反冲能太小，不足以破坏它与母体化合物其余部分结合的化学键，因而依然处于母体化合物的化学状态的数目占子体原子总数的百分数。
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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.
相关于GMP，该一级经销商应负责建立投诉文档并负责保留通常记录的要求。
With regards to the GMP, this initial distributor is responsible for maintaining complaint files and general record keeping requirements.
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