英语词汇optional的翻译、用法及例句-MX2U.com英汉词典

词汇	optional
释义	optional /ˈɔpʃən(ə)l/ adj.任选的；可自由选择的 Is English an optional lesson, or does everyone have to learn it?英语是选修课还是每个人必修的课程？
随便看	echolocate echolocation echo sounder echo through the ages e-cigarette eclair eclat eclectic eclectically eclecticism eclipse eclose eclosion eco- eco-audit eco-auditor ecocide eco-footprint eco-footprint eco-friendly eco-label eco-labeling eco-labelling E. coli ecolodge 蔆\|菱蔆\|菱蔆\|菱蔆\|菱蔆\|菱蔆\|𧅊\|𧁽\|菱蔇蔇蔇蔇蔇蔇蔇蔇蔇蔇蔇蔇蔇蔈

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