Leonid

We tested it last week on twelve- to fifteen-year-olds,

我们上一周曾在十二岁至十五岁的孩子中试过这项游戏，

We should take due care for this accident.

我们应该对这件事给予应有的注意。

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。