When I was young, many children liked to roller skating and So was I. From this exercise, they could enjoy the excitement of speed. They would feel themselves cool. However, due to the development of technology, the roller skates has many great changes. It becomes more and more,for example, convenient. The producers improve this kind of shoe, which has wheels from the heel. If you wear this shoes, you can walk or slip. Many children and teenagers like roller shoes. Nevertheless Science and technology is two sides sword. Although this kind of shoes is much convenient. It also bring some risks. In my opinion, I think it is a serious threat.
I have two concerns. On the one hand,for children or teenagers ，this kind of shoes is a little dangerous.At
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The opponent think people can relax through doing exercise in that people can forget their problems when they exercise. Also if people use the roller shoes,it can save the time.Because the roller shoes have the high speed.And they can spend less time on the road. Firstly, they have not enough time to skate. They have a lot of assignments and they need to go to classes on the every Saturday or Sunday. Additionally there are many competitions in the everywhere. Many parents send their little kids to receive early education and study many difficult classes. Moreover, the way of relieving press has many ways. For example, they can tell your friends and they can listen to slow music. Also they can travel. However, there is not the only way, doing exercise. Also the roller shoes have some dangerous matters. Secondly, to some extent, this kind of shoes can increase speed. Whereas it is risky. When people skate, they happen some accidents and also injury. This condition can waste time in that this situation should not have happened. Slowing down is better and safer. People can save time in many ways. For example, people can use time effectively and can list a time