Students wearing face masks are seen at University of British Columbia (UBC) in Vancouver, British Columbia, Canada, on Sept. 16, 2020. Effective Wednesday, University of British Columbia (UBC) students, faculty, staff and visitors are required to wear masks, when indoors on the campuses, to help limit COVID-19. (Photo by Liang Sen/Xinhua)

Tables are seen arranged to keep a physical distance to one another at University of British Columbia (UBC) in Vancouver, British Columbia, Canada, on Sept. 16, 2020. Effective Wednesday, University of British Columbia (UBC) students, faculty, staff and visitors are required to wear masks, when indoors on the campuses, to help limit COVID-19. (Photo by Liang Sen/Xinhua)

A student wearing a face mask walks out of a bookstore at University of British Columbia (UBC) in Vancouver, British Columbia, Canada, on Sept. 16, 2020. Effective Wednesday, University of British Columbia (UBC) students, faculty, staff and visitors are required to wear masks, when indoors on the campuses, to help limit COVID-19. (Photo by Liang Sen/Xinhua)

Tables are arranged to keep a physical distance to one another at University of British Columbia (UBC) in Vancouver, British Columbia, Canada, on Sept. 16, 2020. Effective Wednesday, University of British Columbia (UBC) students, faculty, staff and visitors are required to wear masks, when indoors on the campuses, to help limit COVID-19. (Photo by Liang Sen/Xinhua)

A student wearing a face mask is seen in a bookstore at University of British Columbia (UBC) in Vancouver, British Columbia, Canada, on Sept. 16, 2020. Effective Wednesday, University of British Columbia (UBC) students, faculty, staff and visitors are required to wear masks, when indoors on the campuses, to help limit COVID-19. (Photo by Liang Sen/Xinhua)

A student wearing a face mask is seen at University of British Columbia (UBC) in Vancouver, British Columbia, Canada, on Sept. 16, 2020. Effective Wednesday, University of British Columbia (UBC) students, faculty, staff and visitors are required to wear masks, when indoors on the campuses, to help limit COVID-19. (Photo by Liang Sen/Xinhua)

Students wearing face masks talk to each other at University of British Columbia (UBC) in Vancouver, British Columbia, Canada, on Sept. 16, 2020. Effective Wednesday, University of British Columbia (UBC) students, faculty, staff and visitors are required to wear masks, when indoors on the campuses, to help limit COVID-19. (Photo by Liang Sen/Xinhua)

Students wearing face masks are seen at University of British Columbia (UBC) in Vancouver, British Columbia, Canada, on Sept. 16, 2020. Effective Wednesday, University of British Columbia (UBC) students, faculty, staff and visitors are required to wear masks, when indoors on the campuses, to help limit COVID-19. (Photo by Liang Sen/Xinhua)