慢速英语:Somewhere a Language Dies Every Two Weeks

1.Experts say over half of the world's seven thousand languages are in danger of disappearing.

in danger of有…的危险

例句：This kind of animal is in danger of becoming extinct.
      这种动物有灭绝的危险。

2.Their ancient languages contain a great deal of information about environmental systems and species of plants and animals that are unknown to scientists.

a great deal of很多的

例句：Some animals have a great deal of cunning.
      一些动物很狡猾。

      She assembled a great deal of information for the report.
      她为写这篇报告收集了大量资料。

3.Why is it a secret language? Kallawaya is passed down within families from father to son as a way of protecting the special knowledge of healers.

pass down把…一代传一代; 使流传
 
例句：This custom has been passed down since the 18th century.
       这个风俗从18世纪就沿袭下来。

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