At this high school in Rome, the principal tells us they will do a rotation system where some students for a week in school and a week online learning from home.

在罗马的这所高中，校长告诉我们，他们将实行轮换制教学，学生先在学校上课一周，再在家进行一周的线上学习。

In the late 1990s, the congestion became so bad in what is now the world's fifth biggest city after Tokyo, Delhi, Seoul and Shanghai that authorities were forced to introduce a number plate rotation system for vehicles.

在 1990 年代后期， 这座仅次于东京、德里、 首尔和上海的世界第五大城市的拥堵情况变得如此严重， 以至于当局被迫引入车辆牌照轮换系统。