“principal section”的概念、定义、翻译、参考文献-科学参考

单词	principal section
释义	principal section [`prin·sǝ·pǝl `sek·shǝn] ^MATHEMATICS A normal section at a given point on a surface whose curvature has a maximum or minimum value. ^OPTICS A plane in a crystal that contains the crystal's optic axis and the ray of light under consideration. Also known as principal plane.
随便看	North America North American anticyclone North American blastomycosis North American high North American Nebula North American presentation-level protocol syntax North Atlantic Current northbound node North Cape Current Northeast Drift Current northeaster northeast storm northeast trades North Equatorial Current norther northerly turning error northern anthracnose Northern Cross Northern Crown Northern Hemisphere northern lights north foehn north frigid zone north geographic pole north geomagnetic pole

科学参考收录了103327条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。