当扩展已经Override了equals的instantiable类时，定义equals的“显而易见的”方式都不能满足equals方法的对称或传递性需求。

The "obvious" ways to define equals when extending an instantiable class that already overrides equals all fail to meet the symmetry or transitivity requirements of the equals method.

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由于个体种化石的的数量统计随着时间的推移而变化，研究生物灭绝的古生物学家们更倾向于对称为类的有相互联系的整个物种种群进行统计研究。

Rather than counting individual species of fossils,which vary over time, palaeontologists who study extinction usually countentire groups of related species, called genera.

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硅藻一种由两个互联对称瓣构成硅细胞壁的、硅藻纲类的微小单细胞或群体的细胞藻。

Any of various microscopicone-celled or colonial algae of the class bacillariophyceae having cell walls of silica consisting of two interlocking symmetrical valves.

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