What we mean by that is, you know, frankly, the PC was invented in 1980, roughly speaking more or less, and for 20-odd years, it hasn't changed.
我们这样说的目的是， 如你所知道，坦白来说，个人电脑在1980年被发明，粗略的说来 大概有20年的历史，它没有什么变化。