N the act or an instance of changing from one method, policy, or technology to another 替换
the switchover to digital television
Within a few years the whole country will switch over to digital television.
几年内全国将会换上数字电视。
Considered to be a less dangerous alternative to tobacco, "e-cigarettes" are taking over the West as more and more people switch over when trying to kick the habit.
随着越来越多的人开始戒烟，被认为危险程度更小的替代物——电子烟在西方国家流行起来了。
Once the database is in a consistent state, users can switch over to the standby database to continue their work.
一旦数据库处于一致状态，用户就可以切换到备用数据库，以便继续他们的工作。
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