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。
Firstly, an average performance index containing tracking error and control energy over a class of additive model errors is defined. 首先針對一類相加模型誤差的描述，定義了一個平均意義上的包含跟蹤誤差和控制能量的性能指標。
