英语词汇effectiveness for a given period of time怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	effectiveness for a given period of time
释义	effectiveness for a given period of time— 时效 See also: a period of time— 期 • 一时 period of time — 期间 • 阵子 • 时光
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英汉双解词典包含2273206条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。

effectiveness for a given period of time—