underweight rice重量不足的大米
constitutional underweight体质性消瘦
severe underweight过低体重
childhood underweight儿童体重过低;孩童时期体重不足
modest underweight轻微减持
extremely underweight premature baby极低体重早产儿
Normal Or Underweight正常或低体重
Infant underweight for gestational age婴儿体重小于胎龄
ADJ（形容词） If someone is underweight, they are too thin, and therefore not healthy. 体重过轻的 [usu v-link ADJ]
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。