绝对能用。原理是在0到1上产生随机数，当随机数小于Lamda的负指数时候循环，直到大于等于。记录次数。近似模拟poisson分布-Absolutely can. Principle is in the 0 to 1 to generate random numbers, when the random number is less than the negative exponential Lamda cycle time, until greater than or equal.

Record number of times. Approximate the poisson distribution