under weight的用法和樣例：
例句
用作形容詞 (adj.)
- One commonly held belief is that coffee can cause low birth weight or miscarriage when consumed by pregnant women.
一般人相信懷孕婦女喝咖啡的話會導致新生兒體重過輕或流產。 - Pregnant women who smoke deprive their babies of needed oxygen and other nutrients which may result in low birth weight.
懷孕婦女若抽煙的話會阻礙胎兒需要的氧氣及其他養份，因此造成嬰兒出生過輕。
