jame -packed day忙碌的一天
news conference新闻发布会
plunged into darkness陷入黑暗
ruled out排除
moved courses for primary and secondary school students online中小学网上授课
a prerecorded lesson预录课程
lesser of two evils两害取其轻
in-person teaching面对面教学
spice up their life增添生活乐趣
played the patriotic tune爱国之歌
The university has sealed off its campus, 学校封锁校园
come to light真相大白，浮出水面
