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challenge，英 ['tʃælɪndʒ]，美 ['tʃælɪndʒ]
n. 挑战；邀请比赛；盘问；质疑
v. 向 ... 挑战；盘问；质疑
形容词: challengeable 过去式: challenged 过去分词: challenged 现在分词: challenging 第三人称单数: challenges
例句：He accepted his friend's challenge to swim across the river.
他接受朋友提出的挑战，游过这条河。
反义词
concede，英 [kən'siːd]，美 [kən'siːd]
vt. 承认；给予；让步；认输
vi. 让步
副词: concededly 名词: conceder 过去式: conceded 过去分词: conceded 现在分词: conceding 第三人称单数: concedes
例句：I concede that you are right.
我承认你是对的。
