单词	back focus
释义	back focus noun : the distance from the rear glass surface of a photographic lens to the focal plane when the lens is focused on a very distant object Word History First Known Use 1868, in the meaning defined above
随便看	unit price unit prices unit pricing unit process unit pulse unit rule unit solid angle unit switch unit train unit trust unit value unit vector unit vote unit watermark unit-set unitable unitage unitages unital unitard unitards unitarian unitarian hypothesis Unitarian Universalist unitarian view

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。