原理 yuánlǐ principle
principle; theory
How to remember 原理: 原 original + 理 reason = principle.
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How it is used
- The underlying principle/theory by which something works - 工作原理 (gōngzuò yuánlǐ) the working principle, 基本原理 (jīběn yuánlǐ) fundamental principles.
- Refers to the scientific/logical mechanism behind a phenomenon or device; contrast 原则 (yuánzé), a guiding principle of conduct/policy.
- Common in science, engineering, and 'how it works' explanations.