重点讲解：
1. difference between
差别；差异；不同之处；
eg. That is the fundamental difference between the two societies.
那是这两个社会之间的根本性差异。
eg. She can see the difference between good and bad.
她能看出好与坏的区别。
2. brand-new
崭新的；簇新的；
eg. The rising sun suggests a brand-new day has come.
东升的太阳表明崭新的一天已经来临。
eg. When she returned, she found that a rock had fallen on her brand-new car.
当她回来的时候，她发现一块石头掉在她的新车上。
3. mark down
减价；降低…的价钱；
eg. Retailers will have to mark down prices sharply to bring in sales.
零售商将不得不为了提高销量而大幅降价。
eg. Clothes are the best bargain, with many items marked down.
买衣服是最划算的，许多衣服都降价了。