| 单词 | focal length |
| 释义 | Word Frequency focal length or focal distance noun the distance from the focal point of a lens or mirror to the reflecting surface of the mirror or the centre point of the lens |
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英语词典包含233703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。