在暑假之余，积极参加“寻访红色足迹”活动，纪念建党九十周年。的翻译：In addition to the summer, to participate actively "looking red footprint" activities to commemorate the 90 anniversary of its founding. 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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In addition to the summer, to participate actively "looking red footprint" activities to commemorate the 90 anniversary of its founding.

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During the summer vacation, actively participated in the "tracing the red footprint" activities 90, marking the 80th founding anniversary.

In addition to the summer, to participate actively "looking red footprint" activities to commemorate the 90 anniversary of its founding.