self.file.flush()
2. 老年教育与文化娱乐： 老年大学、社区艺术培训及适配老年人的数字娱乐内容开发。通过简洁易用的社交平台或虚拟旅游体验，帮助老年人跨越数字鸿沟，消除孤独感 [4, 39]。
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The US-based British content creator, who does not disclose his last name, says he has around 60,000 members in his server on Discord, an online chat service popular with gamers.
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