英语词汇optional system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	optional system
释义	optional — 任择 adj • 可选的 adj • 选配 adj • 选购 adj • 自选 option n — 方案 n • 选择 n • 选择权 n • 可选择的事物 n • 选修课 n • 购买权 n option — 选择 • 期权 system n — 制 n • 制度 n • 体 n • 装置 n • 体制 n • 制式 n • 条贯 n
随便看	held in hand held in higher esteem held in high regard held in-House held in-House held in isolation held in Italy held in jail held in July held in July held in June 2010 held in June 2010 held in lieu held in London held in London held in low esteem held in May held in memory held in October held in partnership held in place held in place magnetically. held in portfolio held in private held in public

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。

optional —