n.挑战；盘问；质疑；怀疑vt.质疑；向…挑战；vi.提出挑战，要求竞赛（或竞争）；驳斥； 变形： 复数：challenges过去式：challenged过去分词：challenged现在分词：challenging第三人称单数：challenges 双语释义：n.(名词)[C]挑战; 邀请比赛 invitation or call to sb to take part in a game, contest, fight, etc. to prove who is better, strong, more