说明：  计算多重积分是蒙特卡罗方法的重要应用领域之一。本章着重介绍计算定积分的蒙特卡罗方法的各种基本技巧，而这些技巧在粒子输运问题中也是适用的
(Calculation of multiple points is an important application of the Monte Carlo method, one of the areas. This chapter focuses on calculation of definite integral of the Monte Carlo method, a variety of basic skills, and these skills in particle transport problems are also applicable to)