国语: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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粤语:拜登上任推翻“基石” 特鲁多先致贺后失望Biden takes office to overthrow “Cornerstone”

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国语: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