1.Doctors say people can do many things to protect themselves from the dangers of extreme heat.

protect from保护

例句：The cover is supposed to protect the machine from dust .
      这个盖子会保护机器不进灰尘。

2.Untreated heat stress can lead to a more serious problem called heat exhaustion.

lead to导致, 引起

例句：In given conditions, a bad thing can lead to good results.
      在一定条件下, 一件坏事可以导致好的结果。

      An ordinary cold can soon lead to a fever.
      一场普通的感冒很快便会引起高烧。

3.Doctors say people with such problems should rest quietly in a cool place and drink plenty of water.

plenty of很多, 大量的

例句：There is plenty of coal in this area.
      这个地区有丰富的煤。

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