Console.WriteLine("原字符串 bbb/ccc/ddd/eee 分隔符 /");
            string[] mulu = "bbb/ccc/ddd/eee".Split(‘/‘);
            for (int i = 0; i < mulu.Length; i++)
            {
                string temp = string.Join("/", mulu.Take(i + 1));
                Console.WriteLine(temp);
            }