two-stage Aitken estimator

例句：

1. 1. The two-stage Aitken estimator was used to estimate the population density in the study area.
   使用两阶段艾特肯估计器来估算研究区域内的人口密度。
2. 2. The two-stage Aitken estimator has been proven to be more accurate than other methods.
   两阶段艾特肯估计器已经被证明比其他方法更准确。
3. 3. The two-stage Aitken estimator is widely used in environmental monitoring and risk assessment.
   两阶段艾特肯估计器在环境监测和风险评估中被广泛使用。