“Petzval lens”的概念、定义、翻译、参考文献-科学参考

单词	Petzval lens
释义	Petzval lens [`pets·väl ´lenz] ^OPTICS A photographic objective which consists of four lenses ordered in two pairs widely separated from each other, with the first pair cemented together and the second usually having a small air space.
随便看	autorail autoranging autoreducing tachymeter autoregressive series autorotation conversion time conversive heating convert converted water converter converter substation converter tube convertiplane convex convex angle convex body convex combination convex curve convex function convex function in the sense of Jensen convex hull convex linear combination convex linear hull convexo-concave convex polygon

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。