英语词汇optional maintenance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 maintenance
释义	optional — 任择 adj • 可选的 adj • 选配 adj • 选购 adj • 自选 maintenance n — 保持 n • 维持 n • 赡养费 n • 定期维修 n option n — 方案 n • 选择 n • 选修课 n • 可选择的事物 n • 选择权 n • 购买权 n option — 选择 • 期权
随便看	win or lose, it all ends here win or lose, it all ends here win or lose, it all ends here win out win out over win over win over customers win over fans win over the hearts win over voters win partnerships win patronage win pattern win people win people over win percent win points win popular support win power win praise win presidential win prizes w in process win project win proposals

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 —