commercial online services long have advertised themselves as offering relatively safe content的翻译：commercial online services long have advertised themselves as offering relatively safe content 什么意思？中文翻译英文，英文翻译中文，怎么说？

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商业在线服务长期标榜自己提供相对安全的内容

commercial online services long have advertised themselves as offering relatively safe content

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commercial online services long have advertised themselves as offering relatively safe content