anthropology is the scientific study of man. 由定义可知,anthropology就是“研究人类的科学”。 In slang the term "jam" constitutes a state of being in which a person finds himself or herself in a difficult situation. 同样,从上下文的定义可知jam一词在俚语中的意思是“困境”。 定义句的谓语动词多为:be, mean, deal with, be considered, to be, refer to, be called, be known as, define, represent, signify, constitute等。