说明：  首先需要一个递减的步长,这里我们使用的是9,5,3,1最后的步长必须是1, 工作原理是首先对相隔9-1个元素的所有内容
(First of all, we need a decreasing step size, and here we're using 9m 5m 3t 1, and the last step size must be 1, which is how it works first for all the elements that are separated by 9-1 elements.)