rationale

• n. 基本原理；原理的阐述
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rationale 根据，理论说明，理论基础

rationale (n.)
1650s, "exposition of principles," from Late Latin rationale, noun use of neuter of Latin rationalis "of reason" (see rational). Hence, "fundamental reason" (1680s).
1. However, the rationale for such in-itiatives is not, of course, solely economic.

2. The rationale of reprocessing spent nuclear fuel is inevitably being questioned.

3. What is the rationale behind these new exams?

4. The plan was criticized for its lack of rationale.

5. A great scholar had recognized that there existed a rationale for production.