英语词汇are required to be retained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	are required to be retained
释义	required — 所需 • 必要 retained — 保留的 adj are — 是 require — 需 • 需要 • 要有 • 要求 • 必需 require v — 规定 v • 命令 v be v — 有 v • 是 v • 当 v • 存在 v • 做 v • 属 v • 乃 v • 成为 v • 乃是 v retain v — 留 v • 保留 v • 保留 v • 保持 v • 留住 v • 挽留 v • 保有 v • 存有 v
随便看	various improvements various impurities various incarnations various incentives various income various Indian various individuals various industrial applications various industries various industry sectors various industry sources various inequalities # various inflammation various info various information various information about various ingredients various initiatives various inlet various inputs various inquiries various inspection various installation various installments various instances

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。

required —