The doctor told me my baby was underweight.

医生告诉我，我的宝宝体重过轻。

And if somebody is very thin, you can call them underweight, skinny, bony, if you can see their bones.

同时，如果某人特别瘦，你可以看到他们的骨头，那么你可以称其为体重不足的、皮包骨的、瘦骨嶙峋的。

Both these animals came in really underweight and emaciated.

这两只海豹一开始都很瘦弱。

I'm at least 45 pounds underweight.

我比标准体重轻至少四十斤。

You're 20 to 30 pounds underweight.

你比标准体重轻了十几二十斤。

Around 80 percent come in underweight and need fattening up.

大约80%的企鹅体重过轻，需要增肥。

In part, that's because newcomers arrive exhausted and underweight.

部分原因是新来者在刚加入时处于疲惫状态，而且体重很轻。

Fasting might not suit those who are underweight or with a long-term medical condition.

禁食可能不适合那些体重过轻或患有长期疾病的人。

About a fourth of the world's underweight people live in India and Bangladesh.

约四分之一的全球体重过轻人口分布在印度和孟加拉国。

Scientists say that four decades ago being underweight was a bigger problem than obesity.

科学家称比起40年前，体重过轻为主要问题。