名词短语
中文翻译：比例理论
同义词：
['proportion theory', 'ratio theory']
例句：
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1.Theories of proportion are essential for understanding the structure of a system.
比例理论对于理解系统的结构至关重要。
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2. In this theory of proportion, each element has a specific role in the overall structure.
在这个比例理论中，每个元素都有其在整体结构中特定的作用。
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3. The theory of proportion is often used to analyze the relationship between variables in a mathematical model.
比例理论常被用来分析数学模型中的变量之间的关系。