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	joint joint abnormalities joint academic joint a capital joint account joint accreditation joint ache joint achievement joint a consortium joint acquisition joint action joint action by the Council Joint action Committee joint action plan joint action programme joint activities joint activity joint adaptation joint address joint adhesive joint adjustment joint administration joint admission joint adoption joint adult

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 —