first-order theory

• 一级近似理论,高斯光学,线性化理论,第一级近似理论

first-order theory的用法和样例：

例句

1. I think, Giddens' structuralization theory can offer the support in this field.
   笔者认为，吉登斯的结构化理论可以为这一思路提供了理论的支撑。
2. Methods According to the limearized theory and the weakly nonlinear theory, the perturbation method is used.
   方法根据线性化理论与弱的非线性理论，运用奇异摄动的方法进行研究。