“relative aperture”概念、定义、翻译-科学时代

单词	relative aperture
释义	物理学词汇手册 relative aperture 相对孔径，相对口径
随便看	close-in protection close-in radioactive fallout close-in security close inverted commas close-in weapon close juncture close library close look roconnaissance satellite close lower closely-held company closely held corporation closely related keys closely set closely spaced line closely-spaced planting close made operation close-magic nucleus close measuring close medium-shot close medium shot（CMS） close miss close-monochromatic radiation close-natural uranium reactor closeness closeness

科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。