off-and-on (adv.)是什么意思，off-and-on (adv.)的翻译，off-and-on (adv.)音标、读音、用法和例句_开心英文字典

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off-and-on (adv.)是什么意思，off-and-on (adv.)的翻译，off-and-on (adv.)音标、读音、用法和例句_开心英文字典_柠咚词