慢速英语:尼日利亚总统连任 反对派候选人拒绝承认结果

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challenge – v. to say or show that (something) may not be true, correct or legal

gloat – v. to show in an improper or selfish way that you are happy with your own success or another person's failure

reward – n. something that is given or received for something that has been done or that is offered for something that might be done

concede – v. to say that you accept or do not deny the truth or existence of something