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单词	actinic focus
释义	actinic focus noun : the focus at which the chemically most effective rays as distinguished from the visually most effective are brought together (as by a lens) called also chemical focus Word History First Known Use 1853, in the meaning defined above
随便看	raveler ravelers ravelian ravelin raveling raveling (out) raveling out ravelings ravelins ravelled raveller ravellers ravelling ravellings ravelly ravelment ravelments ravels ravels (out) ravels out raven raven black raven cockatoo raven gray ravenala

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。