challengen.挑战;邀请比赛;盘问;质疑v.向 ... 挑战;盘问;质疑
Challenge and opportunity挑战与机遇
challenges and adventures挑战和冒险
challenge for jurisdiction管辖权异议
challenge to head the ball争着顶球
Challenges of African Union非洲联盟面临的挑战
challenge the law personally[法] 以身试法
challenges and opportunities挑战与机遇
challenge/response scheme挑战/应答认证机制