One possible version：

In the picture we see a group of children playing hopscotch happily while a boy is sitting in front of his computer ，fully absorbed in a game 。

This picture intends to show how children today and in the past spend their free time。In the old days ，there was no modern equipment such as TV sets or computers ，so childrenkilled time ，playing games outdoors 。with the development of science and technology ，children are so attracted by computer games that they become addicted and stay in front of the screen all day long 。unlike the kids playing hopscotch ，a team game ，the boy who tends to spend more time alone easily develops psychological roblems such as a 1ack of a sense of cooperation and communication skills．

In my opinion，interesting and popular as the computer game is, teenagers shouldn’t lose themselves in it. Instead, it’s not bad to spare some time to do outdoor activities with friends or classmates, which will do good to both their physical and mental health.