重点讲解：
1. guinea pig 实验对象；试验品；
例句：Nearly 500,000 pupils are to be guinea pigs in a trial run of the new 14-plus exams.
这种14岁以上学生参加的最新考试将在近50万名学生中试行yUJi&A5pSW。
2. make a living 谋生；营生；赚钱过活；糊口谋生；
例句：He left his office job to try to make a living on the land.
他辞去了办公室的工作，改以务农为生YL(Cog*YkIKg。
3. bring up 养育；抚养；养大；
例句：His grandmother and his father brought him up.
是他的祖母和父亲把他养大的6j&sHIw4kojk6G。
4. in between 在…之间；处于…中间；
例句：We have two lessons this morning, but there's some free time in between.
今天上午我们有两节课，课间有些休息时间uwK&T%e1AQkgy^|z。
5. use as 用作……；
例句：It was a bit old document but at least you can use it as reference.
这是一个有点老的文件，但至少你可以使用它作为参考LphEdDG4qj%]G。