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（单词翻译）
Haiti cholera victims threaten UN
Vocabulary
cholera
a serious disease, caused by drinking infected water
epidemic
when a disease spreads without control
sewage
human waste
originated
started
endemic
present in a particular area
unprecedented
something which has never happened before
immune
not able to be affected by something bad; protected
mediation talks
conversations to help reach an agreement
to insist
to say something with force
catastrophic
extremely harmful
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