Some students think so we can save resources, reduce waste, save expenditure. The western countries adopt this approachSome other people think that this course of action! Because the material is frequently updated, there is not the book to do a pen一些学生认为这样可以节省资源，减少浪费，节约国家开支。西方国家普遍采用此作法另一些人认为此作法不行！因为教材经常更新，还有就是不能外书上做笔计...
Some students think so we can save resources, reduce waste, save expenditure. The western countries adopt this approachSome other people think that this course of action! Because t...
Some students believe that can saveresources , reduce waste and economize the expense of country. However,western country usually choose this way while others think it is incon...
