maintainability model的用法和樣例：
例句
- A pyramid provides a useful conceptual model for organizing scientific knowledge.
金字塔給科學知識的組織提供了一個有用的概念性模型。 - The model researchers have paid more attention to the additive effect models, and run some experiments to test the additivity principle.
加性模型受到研究人員的重視，並對加性原理進行了實際檢驗。
