本系列的第2部分进一步讨论构造数据模型方面的最佳实践，包括利用Hibernate的多态性、泛型DAO的其他有用特性以及数据模型的性能调优。

Part 2 of this series covers more best practices in constructing a data model by leveraging polymorphism with Hibernate, other useful features of a generic DAO, and performance tuning the data model.

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基因多态性研究可为预防adr提供新的参考依据，临床可在药物治疗前对患者进行基因型检测，以降低adr的发生率。

Gene polymorphism study can provide a new reference for the prevention of ADR. Gene detection can be conducted before drug treatment to reduce the incidence of ADR.

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因每个SSR序列的基本单元重复次数在不同基因型间差异很大，从而形成其座位的多态性。

The repeat times of basic units of each SSR sequence are different among different genotypes, so polymorphism of the seat is formed.

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