其实弄到中文来说就是解释说明
第一句解释了why it is an information serice
第二句是补充the traditional way of gaining education,把具体方法在破折号后面写了出来,就是going to an educational institute and enrolling in classes
gaining education这里是接受教育的意思,the way of gaining education可以改成the way in which we gain education