Getting serious work done means minimizing context switches.

完成重要任务意味着要减少上下文切换。

When a computer goes from one task to another, it has to do what's called a context switch, bookmarking its place in one task, moving old data out of its memory and new data in.

当电脑从一个任务进行到另一个任务时，它需要执行称为上下文切换的任务，给每一个任务标一个书签，将内存中之前的数据移出，导入新的数据。