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Technology has totally changed our life over the past two decades.

在过去的二十年里，科学技术已经完全改变了我们的生活。

The author of these books is a great writer.

这些书的作者是位伟大的作家。

The only way that they can preserve their history is to recount it as sagas -- legends handed down from one generation of another.These legends are useful because they can tell us something about migrations of people who lived long ago, but none could wri

他们保存历史的唯一办法是将历史当作传说讲述，由讲述人一代接一代地将史实描述为传奇故事口传下来。