Underweight:
Underweight is a term describing a human whose body weight is considered too low to be healthy.
en.wikipedia.org
体重不足:
体重不足指一個人的體重低於健康水平,通常以身高體重指數(BMI)作指標,BMI值低於18.5屬於体重不足。
zh.wikipedia.org
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Underweight体重不足