重点讲解：
1. tell apart 区分；区别；辨别；
例句：Perhaps it is the almost universal use of flavourings that makes it so hard to tell the products apart.
或许是因为调料的使用几乎千篇一律才使得那些产品难以区分开hJ*B13Fl!nLQ。
2. come up with 想出，提出(计划、想法等)；
例句：She came up with a new idea for increasing sales.
她想出了增加销售量的新主意jhL,DWBjsU@。
3. be unique to 独有的；特有的；
例句：The koala is unique to Australia.
树袋熊是澳大利亚独有的ZbKmI!D8P=9RAuy。
4. prop up 支撑；维持；
例句：Investments in the U.S. money market have propped up the American dollar.
对美国资金市场的投资扶持了美元=5*fmye~bP.Dp!36+M。