VOA慢速英语:南苏丹和平活动家获美国奖项

passionate – adj. having, showing, or expressing strong emotions or beliefs

orphan – n. a child whose parents are dead

behalf – n. as a representative of someone

disappointed – adj. feeling unhappy or displeased because something you hoped for or expected did not happen

standard – n. a level of quality that is considered acceptable or desirable

challenge – n. a difficult task or problem