modell(1. A representation, usually on a smaller scale, of a device, structure, etc. 2. A quantitative or mathematical representation or computer simulation which attempts to describe the characteristics or relationships of physical events)
modelling An investigative technique using a mathematical or physical representation of a system or theory that accounts for all or some its known properties. Models are often used to test the effect of changes of system components on the overall performance of the system['mɔdlɪŋ]动词
