It's not always some mysterious plague or natural disaster - we're usually talking about far more common things like malaria, diarrhea, measles and unclean water.
答案并非寻常想到的神秘瘟疫或自然灾害，而是更寻常不过的疟疾、腹泄、麻疹和不干净的水。
Without adequate nutrition and clean water, a person quickly weakens and falls prey to sicknesses like diarrhea, meningitis, malaria and yellow fever.
人一旦没有适当的营养和干净的饮水，很快就会虚弱无力，容易罹患腹泻、脑膜炎、疟疾、黄热病等疾病。
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