Model parameters and their corresponding prior distributions.

U(x,y) is a Uniform distribution from x to y. N(x,y)[w,z] is a normal distribution with mean x and standard deviation y truncated so its values are always between w and z.U(x,y) 表示定义在区间x至y上的均匀分布（Uniform distribution）。N(x,y)[w,z] 表示以x为均值、y为标准差的截断正态分布，其所有取值始终被限制在w与z之间。