bivariate normal surface

例句：

1. 1. The bivariate normal surface is used to model the relationship between two variables.
   双变量正态曲面用于建模两个变量之间的关系。
2. 2. In this study, we used a bivariate normal surface to analyze the relationship between temperature and humidity.
   在这项研究中，我们使用了一个双变量正态曲面来分析温度和湿度之间的关系。
3. 3. The bivariate normal surface can be used to predict the performance of a system based on itsinput and output variables.
   双变量正态曲面可以用来预测一个系统的性能，基于其输入和输出变量。