请教一个英语问题,望大神不吝赐教,
句子如下:I revealed that overuse of internet among college students hinges on the following several factors: first, attracted by free and unlimited internet access within huge blocks of unstructured time. Second, newly experienced freedom from parental control and desire to escape college stresses.
不知道first和second后是什么成分?好像不是句子。