在核心部分所示，一个适应度值是一个浮点值的列表并有一个有效的属性来知道这个个体是否应当重新评估。

As shown in the in the core section, a fitness is a list of floating point values and has a property valid to know if this individual shall be re-evaluated.

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当主控物件执行个体化时，会从字串中转换属性值。

Property values are converted from strings when the owning object is instantiated.

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在最后一个阶段，模型和基础执行个体都会执行个体化，并从字串转换成属性值并予以指派。

In the last phase, the model and the underlying instances are instantiated and property values converted from strings and assigned.

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