bivariate exponential desity functions

例句：

1. 1. The bivariate exponential distribution is commonly used in modeling the time series of stock prices.
   双变量指数分布常用于建模股票价格的时间序列。
2. 2. In this study, we use the bivariate exponential distribution to simulate the traffic flow on a busy highway.
   在这项研究中，我们使用双变量指数分布来模拟繁忙高速公路上的交通流量。
3. 3. The bivariate exponential distribution is widely used in various fields such as finance and engineering.
   双变量指数分布在金融和工程等多个领域得到了广泛应用。