a call to someone to participate in a competitive situation, game, or fight to decide who is superior in terms of ability or strength 挑战 he accepted the challenge. 他接受了挑战。 ■a task or situation that tests someone's abilities 考验 the traverse of the ridge is a challenge for experienced climbers. 穿越这座山脊对经验丰富的登山者来说也是一种考验。 ■an attempt to win a contest or championship in a sport (体育比赛的)求胜心
an objection or query as to the truth of something, often with an implicit demand for proof 异议;质疑 a challenge to the legality of the banning order. 对禁令合法性的质疑。 ■a sentry's call for a password or other proof of identity (岗哨验明身份的)口令盘问,暗号盘问 ■(Law)an objection regarding the eligibility or suitability of a jury member (律)(对陪审员资格或合适性提出的)反对
[mass noun](Medicine)exposure of the immune system to pathogenic organisms or antigens (医)激发免疫反应,免疫系统与病原体(或抗原体)的接触 recently vaccinated calves should be protected from challenge. 需保护刚接种疫苗的小牛,使其免疫系统不与病原体接触。
verb [with obj.]
dispute the truth or validity of 对(事物)的真实性(或有效性)提出质疑 It is possible to challenge the report's assumptions. 对报告中的假设提出质疑是有可能的。 ■(Law)object to (a jury member) (律)反对(陪审员) ■(of a sentry) call on (someone) to prove their identity (岗哨为验明身份)向…盘问口令
invite (someone) to engage in a contest 邀请…参加比赛,发出挑战 he challenged one of my men to a duel. 他向我的一个随从发出挑战,要求决斗。 ■enter into competition with or opposition against 与…竞争;反对… organizations challenged the government in by-elections. 各组织在补缺选举中与政府一争上下。 ■make a rival claim to or threaten someone's hold on (a position) 对(某人的地位)提出竞争;威胁(某人的地位) they were challenging his leadership. 他们威胁着他的领导地位。 ■[with obj. and infinitive]invite (someone) to do or say something that one thinks will be difficult or impossible 故意为难(某人) I challenge the Minister to deny these accusations. 我故意为难部长,要求他否认这些指控。 ■[usu. as adj. challenging]test the abilities of 考验人 challenging and rewarding employment. 考验人但很有回报的工作。
(Medicine)expose (the immune system) to pathogenic organisms or antigens (医)使(免疫系统)与病原体(或抗原体)接触
Middle English (in the senses 'accusation' and 'accuse'): from Old French chalenge (noun), chalenger (verb), from Latin calumnia 'calumny', calumniari 'calumniate'