We discuss both advantages and disadvantages, we also discussed the variance reduction methods ( important sampling, control variance, antithetic variables, while using Monte-Carlo method) to improve the accuracy. 我们讨论了两者的优点和缺点,我们还为了提高准确度和蒙特卡洛方法结合讨论了方差缩减方法(重要采样,控制方差,对偶变量)。