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重点讲解：
1. lift off （飞机、火箭等）起飞，升空，发射；
The rocket is due to lift off at noon on Friday.
火箭定于星期五中午发射。
2. serve as 用作；可当…使用；充作；
The sofa will serve as a bed for a night or two.
沙发可以当床凑合一两夜。
3. push ahead with 推进；推行；
How to better push ahead with the project is under discussion.
如何更好地推进这个项目正在讨论中。
4. according to 据（…所说）；按（…所报道）；
According to law, a doctor must be present at the ringside.
按法律规定，场边必须有一名医生。
vt. 推进，提高，增加
n. 推进，增加
