| 单词 | principal axis |
| 释义 | principal axisnounOptics. a 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. Physics. one of three mutually perpendicular axes of a body about which the moment of inertia is maximum or minimum. Origin of principal axisFirst recorded in 1875–80 Words nearby principal axisPrinceton, Prince William Sound, principal, principal argument, principal artery of thumb, principal axis, principal boy, principal clause, principal diagonal, principal focus, principal ideal Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for principal axisprincipal axis nounthe line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror any of three mutually perpendicular axes about which the moment of inertia of a body is maximum Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 |
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