VOA慢速英语:科学家首次发现恐龙中致命癌症的证据

fossil – n. the mineralized remains of plants or animals that lived a long time ago

malformed – adj. not having the expected shape because of some problem affecting growth or development

tumor – n. a mass of tissue in the body that is made up of cells that are not normal

lame – adj. unable to walk normally

signature – n. a sign that confirms something's identity

horn – n. a hardened growth on the head of some animals such as cattle, goats and sheep

complication – n. a health problem that arises in addition to an existing one

mythical – adj. imaginary, something told about in stories but that is not real