粤语：多伦多实验表明：学校师生新冠感染比例远低于家长proportion of covid19 among teachers and students is lower than parents
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历史上的今天之微软创始人之一 保罗·艾伦出生

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粤语：多伦多实验表明：学校师生新冠感染比例远低于家长proportion of covid19 among teachers and students is lower than parents

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