一些实体具有某些共同的属性，比如标识符(主键)，而其他属性不同，这些实体可能具有共同的超类型。

Entities that share some attributes, including an identifier (primary key), but not others may be modelled as having a common supertype.

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首次建立超微粒子费密算符理论。

The theory of Fermi operator is developed.

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本文使用超维里定理与升降算符方法，导出了氢原子跃迁矩阵元与平均值计算的一些递推关系式。

Some recursive relations were derived for the radial matrix elements of Hydrogenic Atom using hypervirial Theorem and ladder operators.

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