1.当问到优劣势的时候，可以这样：Well, it is really hard to say, you know, every coin has two sides. Personally, there are both advantages and disadvantages with regard to this issue, and I may say the advantages first. One of the major advantages is...
2.当问到观点类的问题是，一般大家开头可能是 I think/guess 等等。其实大家可以用下面这句来稍微拖下时间，例如 : Well, to the best of my knowledge/ as far as I am concerned, I may give vote to the former/latter opinion...
