名词
中文翻译：体重不足
同义词：
['undernourished', 'underweight']
例句：
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1.She was underweight and needed to gainweight quickly.
她体重过轻，需要迅速增重。
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2. The baby is underweightand needs extra care.
这个婴儿体重过轻，需要额外的照顾。
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3. Manyathletes are underweight dueto poor nutrition.
许多运动员由于营养不良而体重过轻。