n.基本原理；基礎(chǔ)理論
The rationale of direct foreign investment has changed. 國外直接投資的基本原理起了變化。
What is the rationale behind these new exams? 這些新測試的理論依據(jù)是什么?
The rationale for the present study is evident. 該研究的理論基礎(chǔ)是明顯的。
