单词	T-number
释义	T-number noun : a number that is similar to the f-number but takes into account the amount of light actually transmitted by a lens after loss by absorption and reflection and that equals the f-number divided by the square root of the transmittance Word History Etymology total light transmission + number
随便看	saarland Saarlander sab sab-cat saba Saba Sabadell sabadilla sabadillas sabadine sabadinine sabae Sabaean sabaean sabaeans Sabah sabahans sabahs sabai grass sabakha sabal palmetto sabales sabalo sabalote sabals

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。