AC - AT Model的用法和样例：
- Do you know how to set the copier at model of compact(enlarge)?
- Do you know how to set the printer at model of enlarge?
- METHODS: Ar at model of pressure-overloaded heart was induced by constriction of abdominal aorta.
- You'd expect Fender to be better at modeling a Fender device.
- John is repairing his model plane at his leisure.