这组词都可形容人“瘦”。它们的区别是： thin以中性的方式来描写人的外貌,常同营养、疾病有较多牵连,不含褒贬义; slim描写人的外貌时有瘦得很美的含义,带有褒义; lanky用来描述人又高又瘦,含有幽默的意味; underweight指描述人因吃得不好或生病而过“瘦”。例如: She was tall and thin, with fairish hair.她高高瘦瘦的,留着长发。 She used to be pretty and slim.她过去非常漂亮苗条。 Tom was a lanky boy with long skinny legs.汤姆是一个腿很细的瘦高个儿。 Many people who are underweight are happy with their size.许多人很喜欢自己那种过于瘦的身材。