对于学生来讲,书包是再平常不过的学习用品。可是,我的书包不仅装着我的宝贝文具,还装着许多秘密。什么秘密?请你听我说——每天早上,妈妈都会往我的书包里装一盒纯牛奶,让我在上午大课间时喝。妈妈说,多喝奶才能长高个儿、长智慧。生病的时候,爷爷总会往我的书包里装一 For students, school bags are more than normal school supplies. However, my schoolbag is not only loaded with my baby stationery, but also filled with many secrets. What secret? Please listen to me - every morning, my mother will put in my bag a box of pure milk, let me drink during the big class in the morning. Mom said, drink more milk to grow taller, longer wisdom. When I was sick, my grandpa always put one in my bag