Wrong Cost...

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Don't afraid of make mistake,change it,is this? I remembered when i was a pupil,my chinese teacher corrected students' homework like this:take up the homework book according to the bright,if there has eraser trace must be dedect points. He doesn't allow us to make a mistake,even cannot tolerate the mistake which already corrected. After when i grow up,i know that,under his harsh request,i nearly write wrong. The teacher let me know:wrong is wrong,even it's already corrected.If correct too easy,we may easily to make a mistake. Until now,see somebody who make a mistake easily,i know that is because change is too easy.Today's view is the wrong cost too lower. What's your view?