完美的造型必须具有统一性与变化性，因此“统一与变化”是拖拉机造型设计中必须遵循的法则。
The perfect molding must have unity and variety, so "unity and variety" is the rule that the tractor molding design have to observe.
在工业设计中形式美的法则对设计师以及设计思想理念有指导性作用。
In the industrial design in the laws of formal beauty and the design ideas of the designer idea of guiding role.
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