Women who smoke risk giving birth to underweight babies.

抽烟的妇女生出的婴孩可能会体重不足。

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。

We took an underweight position in Ecuadorian bonds.

我们减持了厄瓜多尔债券。

The lion and two tigers were more than 65 pounds underweight.

这头狮子和两只老虎都严重重量不足，比正常体重低65磅。

A BMI of 30 or higher is considered obese, and under 18.5 underweight.

体重指数为30或更高被视为肥胖，而体重低于18.5则被认为是体重过轻。