重点讲解：
1. specialise in
专门从事；专门经营；专门研究；专攻；
eg. As you know, we specialise in electronic games.
正如你们多了解的，我们专门经营电子游戏。
eg. That doctor specialises in children's illnesses.
那位医生专门研究儿科疾病。
2. lose count of
记不清…的数目；
eg. She had lost count of the number of times she'd told him to be careful.
她不知多少次告诉过他要小心。
eg. She'd lost count of the interviews she'd been called for.
她都记不清接受过多少次采访了。
3. just in case
以备；以防；免得；
eg. Always set up contingency plans, just in case.
准备好应急措施，以防万一。
eg. I wasn't intending to buy anything but I took my cheque book just in case.
我不打算买什么东西，但带着支票簿以防万一。
4. turn sb.'s nose up at sth.
对…不屑一顾；嫌弃；
eg. He turned his nose up at the job offer from that company.
他对那家公司提供的工作不屑一顾。
eg. It's no good turning you nose up at it, you've got to wear school uniform.
你必须穿校服，不要对这种制度嗤之以鼻。