2021年2月23日，星期二，加拿大不列颠-哥伦比亚省素里，学生戴着口罩和面罩和家长走过人行道。一名路口执勤人员拦住了交通。THE CANADIAN PRESS/Darryl Dyck
A crossing guard stops traffic as students wearing face masks and shields to curb the spread of COVID-19 arrive at Ecole Woodward Hill Elementary School, in Surrey, B.C., on Tuesday, February 23, 2021. A number of schools in the Fraser Health region, including Woodward Hill, have reported cases of the B.1.7.7 COVID-19 variant first detected in the U.K. THE CANADIAN PRESS/Darryl Dyck
加拿大不列颠-哥伦比亚省素里，学生戴着口罩和面罩和家长走过人行道
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