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（单词翻译）
本期内容：
Tim Berners-Lee, credited with inventing thetechnology behind the world wide web, sounded thealarm about three existential threats to it in an openletter published to celebrate the web’s 28thbirthday. Sir Tim said that a loss of control overpersonal data had a “chilling effect on free speech”and warned of the dangers to democracy of fakenews and unregulated political advertising.
Credited with: 以……成就
Invent：发明
Sound alarm：拉响警报
Existential：生存性的
Chilling effect：令人恐惧的影响
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