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为80岁母亲手机设三重“防骗墙”失效，“技术男”把亲身经历告诉大家引以为戒
For the most important layers of everyday digital life, viable alternatives are already available and widely used. Think of what you might call the “easy five”: search engines, browsers, operating systems, office software and social media platforms. Switching between them is not a moonshot innovation challenge. It is often a matter of a few clicks.