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重点讲解：
1.ought to do 应该做某事
例句：Perhaps we ought to do a bit of market research to find out what is to our disadvantage.
也许我们该做点市场调查找出对我们不利的因素。
2.give a talk 做报告；演讲
例句：Today I feel greatly honored to be invited to give a talk on this subject.
今天非常荣幸受邀就这一主题进行演讲。
3.first of all 首先；首要
例句：First of all that food, light diet to lose weight is not superstitious, the body will be hungry virtual.
首先说饮食，光节食来减肥是不迷信的，身体会饿虚。
4.live on 以…为主食；靠…生活
例句：Cats now live on cat food rather than catching rats for their food.
猫已以猫粮为主食而不是抓老鼠为食。
