computer games is a hot topic nowadays. some people hold that it is bad. and others hold that it is good. in my view, whether good or bad is determined by the players.   

　　if one plays computer game properly in his spare time, computer games can be an excellent source of joy. for example, something impossible in your real life can be realized in the computer  games. you can pilot a space craft and travel in the universe. every coin has two sides. if one plays computer game excessivly, it may affects his eyesight and study.  

　　the computer games itself is only a tool like knife. if we use it properly, it can pare apples. but if we use it to attack others. it immediatly becomes an lethal weapon.