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1.underweight adj. 重量不足的 n. 重量不足；不符合要求的重量
Nearly a third of the children were severely underweight.
约有三分之一的孩子曾严重体重过轻。
2.malnutrition n. 营养失调，营养不良
Infections are more likely in those suffering from malnutrition.
感染更有可能发生在那些营养不良的人身上。
3.immunization n. 免疫
Health workers spread the word about the benefits of immunization.
医疗工作者宣传关于接种疫苗的好处。
4.sanitation n. [医] 环境卫生；卫生设备；下水道设施
The location is exceptionally poor, viewed from the sanitation point.
从卫生角度来看， 这个地段非常糟糕。
