重点讲解：
1. be absent from 不在的；缺席的；
The pictures, too, were absent from the walls.
那些画也不在墙上了I4AKtG;PU#;x。
2. hang around （在某处）等待，闲逛，闲呆着；
Humans, the story goes, realized this was rather useful, and let the least aggressive pups hang around.
传说，人类意识到这种动物很有用，于是允许一些最不具攻击性的小狗在人类居住地周围徘徊vTl,eShumDD+1%Z。
3. in theory 从理论上说；照理说；
In theory, these machines should last for ten years or more.
从理论上讲，这些机器应能用十年以上)MqI@AKGx=U|Y]Ei!s3d。
4. take into account 考虑到；把…计算在内；
Coursework is taken into account as well as exam results.
除考试结果外，课程作业也要计入成绩xU^2Q%(y|rRM5AAW8。