英语词汇it has been necessary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	it has been necessary
释义	necessary — 必要 • 必须 adj • 必要的 adj • 所需 adj • 必需 adj • 不可或缺 it pron — 它 pron IT — 信息技术 • 技术情报 has-been — 过气 necessary n — 需要 n
随便看	surveillance cameras surveillance capabilities surveillance capability surveillance capacities surveillance carried out surveillance center surveillance check surveillance commissioner surveillance committee surveillance concept surveillance control surveillance costs surveillance data surveillance data collection surveillance decision surveillance department surveillance design surveillance detection surveillance efforts surveillance environment surveillance, epidemiology, and end results surveillance equipment surveillance factory surveillance flight surveillance footage

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。

necessary —