The requirement that children go to school for about six hours a day, 180 days a year, for about 10 years,  whether or not he learns anything there,  whether or not he already knows it or could learn it faster or better somewhere else,  is such a gross violation of civil liberties.

老师好，请问 for about six hours a day, 180 days a year, for about 10 years,  中，180 days a year为什么不加for…