求翻译：众所周知，预测未来是非常困难的。比如，在20世纪70年代中叶有谁能想象得到20世纪末的时候，计算机会像电视机一样普遍。在70年代，计算机已经相当普及。但它们的主机太大占据了许多空间。然而，它们已经被小而功能齐全的个人电脑所代替了。是什么意思？

As we all know, to predict the future is very difficult. For example, in the mid-1970s, who can imagine the late 20th century when the computer is as common as TV sets. In the 1970s, the computer is already quite popular. But their host is too large to occupy a lot of space. However, they have a sma

It is well known that predict the future is very difficult. For example, in mid 70s of the 20th century, who could have imagined at the end of the 20th century, the computer is like a television set. During the 70s, the computer has become quite popular. But they are too large in the host a lot of s

It is well known, the forecast future will be extremely difficult.For instance, can be able to imagine 20 century's ends in 20th century 70's middle some who times, the computation opportunity television equally is likely common.In the 70's, the computer already quite popularized.But their main engi

As we all know, are very difficult to predict the future. For example, in the mid 1970 of the 20th century who can imagine that 20 century, when computer is generally like a TV. In the 70 's, the computer is already very popular. Host too but they occupy a lot of space. However, they have been repla

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