1 price. Sharp knife rolls are cheap, as long as each roll is 23 yuan, while primary school schoolmasters want one roll in 40 yuan, which is not cost-effective.

2. Grade. The sharp knife roll is a primary school synchronous test paper under the brand of brainstorming, which belongs to the middle and high grade, while the primary school Xueba Chong A roll is a small brand roll, which belongs to the low grade, so the sharp knife roll is good.