評論
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重點講解：
1.ought to do 應該做某事
例句：Perhaps we ought to do a bit of market research to find out what is to our disadvantage.
也許我們該做點市場調查找出對我們不利的因素。
2.give a talk 做報告；演講
例句：Today I feel greatly honored to be invited to give a talk on this subject.
今天非常榮幸受邀就這一主題進行演講。
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.
首先說飲食，光節食來減肥是不迷信的，身體會餓虛。
4.live on 以…為主食；靠…生活
例句：Cats now live on cat food rather than catching rats for their food.
貓已以貓糧為主食而不是抓老鼠為食。
