The results showed that litter effect only reflected part of the permanent environmental effects and full order fit was necessary to estimate the covariance functions.

结果表明，窝效应只能反映部分永久环境效应，估计协方差函数时需配合全阶多项式；

youdao

If it is to fit the present day, the permanent class should include India, Brazil and (probably) South Africa.

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