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VOA慢速英语:Banana Protein May Be Virus Killer
2015-11-10来源:VOA
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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