1.  As they are students that need to focus their minds on studying and love may cause adverse effect on their learning, this phenomenon has raised heat discussion.

2.  The phenomenon has raised public attention.

3.  This phenomenon raises concerns both home and abroad.

4.  In the consideration of its pros and cons , this phenomenon has raised a heated discussion.

5.  This phenomenon has raised our care whether the Internet keeps us close or not .

6.  This phenomenon has raised great concern both domestically and abroad.