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重点讲解：
1. for free 义务地；无偿地；免费地；
I wasn't expecting you to do it for free.
我并没有指望你白干。
2. set up 创建；建立；安排；组建；
A new telegraph line has been set up between the two cities.
那两个城市之间架设了一条新的电报线。
3. turn into (使)变成；(使)成为；
Our dream holiday turned into a nightmare.
我们梦想的假日变成了一场噩梦。
4. be willing to do sth. 乐意的；愿意的；
Few firms will be willing to gamble on new products.
很少有公司愿意冒险开发新产品。
