VOA慢速英语:Haiti's Cholera Outbreak Puts Pressure on Capital

not always部分否定

all，every，both，always等用于否定结构时不是全部被否定，而是表示其中的一部分被否定。而且英语多半将not置于谓语中。

2.Medical workers in Haiti are now trying to spread the message not to use river water without some form of purification.

前面的部分是主干，not to use river water是the message的同位语。without some form of purification表示条件，在没有……的条件下。

3. People are being urged to take steps like adding a small amount of bleach to the water or boiling it for at least a full minute.

take steps采取措施

例句：They took steps to prevent the spread of influenza.
      他们采取措施阻止流感的传播。