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重点讲解：
1. specialize in 专门从事；专门经营；专门研究；专攻；
例句：Many students specialize in engineering.
许多学生专攻工程学。
2. right now 现在；此时此刻；
例句：Right now, jeans are at a discount.
现在牛仔裤打折销售。
3. cobble together 拼凑；迅速筹集；
例句：Analysts expect Japan to cobble together a workable energy grid in the next few weeks.
分析者预计日本将在接下来的几周内迅速建成一个可用的能源网络。
4. back and forth 来回；往返；
例句：The Spring Festival was approaching. A lot of people were travelling back and forth.
春节到了，来往的旅客很多。
n. 折扣，贴现率
vt. 打折扣，贴现，不重
