基本解释[经济学]二元随机变数词组短语短语bivariate continuous random variable 二维连续型随机变量bivariate discrete random variable 二维离散型随机变量bivariate normal random variable 二元正态随机变量discrete bivariate random variable 离散二元随机变数bivariate random variable更多词组专业释义经济学二元随机变数