(1)依实物的形状和结构按比例制成的物品,用于展览或实验(a small copy or imitation of an existing object made to scale for exhibition or experiment);

(2)制造产品之前制作的参考雏型或结构(a preliminary work or construction that serves as a plan from which a final product is to be made);

(3)对系统、理论或现象的示意性描述,用来解释其已知的或推断的性质,也可用于进一步研究其特点(a schematic description of a system, theory, or phenomenon that accounts for its known or inferred properties and may be used for further study of its characteristics)


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