VOA慢速英语:Monkeys Can Be as Spiteful as Humans

spite – n. a desire to harm another person because you feel that you have been treated wrongly or unfairly

previously – adv. happening at an earlier time

unique – adj. used to say that something or someone is unlike anything or anyone else

embarrassing – adj. to make (someone) feel confused and foolish in front of other people

tendency – n. a quality that makes something likely to happen or that makes someone likely to think or behave in a particular way

relatively – adv. when compared to other