昨天我们学校举办了一次关于健康知识的讲座的翻译：Yesterday we held a lecture on health knowledge 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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Yesterday we held a lecture on health knowledge

Yesterday our school has conducted one time about the healthy knowledge course

Yesterday, we had organized a conference on school health talks and knowledge

Yesterday we held a lecture on health knowledge