重点讲解:
1. 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 。
2. compared to 与…相比;和…比起来;
Standards in health care have improved enormously compared to 40 years ago.
与40年前相比,卫生保健的水平得到了极大提高 。
3. start off 一开始是;
Joe Loss started off playing piano background music for silent films in the 1920s.
乔·洛斯先是于20世纪20年代为无声电影弹奏钢琴背景音乐 。
4. come in contact with 接触;遇见;
If you come in contact with a victim's blood or other body fluids, you can get sick.
如果你与受害者的血液或其他体液相接触的话,你会生病的 。