VOA慢速英语:Banana Protein May Be Virus Killer

biodegradable – adj. capable of being slowly destroyed and broken down into very small parts by natural processes, bacteria, etc.

stomach acids – n. digestive secretions of the stomach glands

chew – v. to injure, destroy, or consume as if by chewing

cautious – adj. careful about avoiding danger or risk

ambitious – adj. having a desire to be successful