这种模型的未知参数分两类，一类是固定效应，一类是方差分量。
The unknown parameters of this model are divided into two categories: one is the fixed effects, and the other is the variance components.
这种模型的未知参数分两类，一类是固定效应，一类是方差分量。
The unknown parameters of this model are divided into two categories: one is the fixed effects, and the other is the variance components.
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