Mr. Doub makes these suggestions for making rules in your home.

都伯先生为你制定的家庭规则提出如下建议。

The relationship between environmental factors (climate and soil) and plant life form gradient was analysed by doub sieving progressive regression method, and mathematical models were set up.

并用双重筛选逐步回归的方法分析了环境(气候和土壤)因子与植物群落生活型谱梯度的关系，建立了相应的数学模型。