| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024prin′cipal ax′is, - Opticsa line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror.
- Physicsone of three mutually perpendicular axes of a body about which the moment of inertia is maximum or minimum.
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