错误的教训(A lesson of my mistake)

　　错误的教训-共两篇

　　第一篇：

　　A lesson I never forget.I remember that morning ,my teacher told us that this lesson was very difficult for us to learn,and told us to go over it carefully.But Ididn t think it is important,So I didn t go over it.I played the computer games instead.Next day we had an exam,I failed it.I learnt that student must study hader.No pains no gains!