According the information depicted the bar chart,the play a jod condition have different proportation in different grades.Among then the older student have most proporation to play a job.The higher grade,the more proporition to play a job.

Seveval factors form various perspective can account for this trend.Above all ,higher grade would impove their ability by working,beacuse labor is the best way to excersie themselves.Another wise,work can open their horizons and make a buffet between school and society.Futher,good work experience can help them to find better job and higher salary.With the higher grade influence,the lower grade also would play a job to prepare their future.In the end,society econonmics had impoved rapidly,more and more student want have a high saiary that need them have more work experience.So student must to play a job.

We should bear in mind that play a job proportion is of great importance to our society.For the reasons mentioned above,it can be predicted ...