名詞 challenge:

1. a demanding or stimulating situation
2. a call to engage in a contest or fight
3. questioning a statement and demanding an explanation
4. a formal objection to the selection of a particular person as a juror
5. a demand by a sentry for a password or identification

動(dòng)詞 challenge:

1. take exception to
   同義詞：dispute, gainsay
2. issue a challenge to
3. ask for identification
4. raise a formal objection in a court of law
   同義詞：take exception

1. The time was ripe for a challenge to the power of the government.
   時(shí)機(jī)已經(jīng)成熟，可以向政府權(quán)力提出挑戰(zhàn)了。
2. They had challenged and beaten the best team in the world.
   他們?cè)蚴澜缟献顝?qiáng)的球隊(duì)挑戰(zhàn)并將他們打敗。
3. This career offers a challenge.
   這份職業(yè)具有挑戰(zhàn)性。
4. Nowadays no one will challenge the fact that the earth is round.
   現(xiàn)在沒(méi)有人會(huì)對(duì)地球是圓的這一事實(shí)提出異議。

chal.lenge

n.（名詞）

A call to engage in a contest, fight, or competition:
挑戰(zhàn)：提出挑戰(zhàn)、競(jìng)賽或競(jìng)爭(zhēng)：
例句：
a challenge to a duel.
挑戰(zhàn)要求決斗

An act or statement of defiance; a call to confrontation:
對(duì)抗：反對(duì)的言論或舉動(dòng)；公然對(duì)抗：
例句：
a challenge to the government`s authority.
公然對(duì)抗政府權(quán)威

A demand for explanation or justification; a calling into question:
質(zhì)疑：要求解釋或證明為正當(dāng)；質(zhì)疑：
例句：
a challenge to a theory.
對(duì)一項(xiàng)理論質(zhì)疑

A sentry`s call to an unknown party for proper identification.
口令，暗號(hào)：哨兵大聲向一群不認(rèn)識(shí)的人索要身份證明
A test of one`s abilities or resources in a demanding but stimulating undertaking:
挑戰(zhàn)：在要求高但振奮人心的事業(yè)中對(duì)人的能力與才智的考驗(yàn)：
例句：
a career that offers a challenge.
大有作為的事業(yè)

A claim that a vote is invalid or that a voter is unqualified.
選舉無(wú)效的聲明：聲稱某一投票無(wú)效或某一投票人不合格
Law A formal objection to the inclusion of a prospective juror in a jury.
【法律】 宣布反對(duì)：正式對(duì)某位預(yù)期的陪審員列入陪審團(tuán)表示異議
Immunology The induction or evaluation of an immune response in an organism by administration of a specific antigen to which it has been sensitized.
【免疫學(xué)】 激發(fā)：對(duì)某有機(jī)體注入使它敏感化的特定抗原以誘導(dǎo)或評(píng)價(jià)它的免疫反應(yīng)
v.（動(dòng)詞）
chal.lenged,chal.leng.ing,chal.leng.es
v.tr.（及物動(dòng)詞）

To call to engage in a contest, fight, or competition:
挑戰(zhàn)：提出挑戰(zhàn)、競(jìng)賽或競(jìng)爭(zhēng)：
例句：
challenged me to a game of chess.
以下棋向我挑戰(zhàn)

To invite with defiance; dare:
公然挑戰(zhàn)；公然反抗：
例句：
challenged him to contradict her.See Synonyms at defy
挑動(dòng)他去反對(duì)她參見(jiàn) defy

To take exception to; call into question; dispute:
表示異議；質(zhì)疑；爭(zhēng)議：
例句：
a book that challenges established beliefs.
對(duì)確定的信念表示異議的書(shū)籍

To order to halt and be identified, as by a sentry.
驗(yàn)明身份：（被哨兵）命令停止前進(jìn)并查明身份
Law To take formal objection to (a prospective juror).
【法律】 提出反對(duì)：（對(duì)預(yù)期的陪審員）正式表示反對(duì)
To question the qualifications of (a voter) or validity of (a vote).
對(duì)（投票人的）資格或（選票的）有效性質(zhì)疑
To have due claim to; call for:
正式要求；需要：
例句：
events that challenge our attention.
引起我們注意的事件

To summon to action, effort, or use; stimulate:
運(yùn)用，激勵(lì)：要求行動(dòng)，努力去做，或發(fā)揮作用；激勵(lì)：
例句：
a problem that challenges the imagination.
運(yùn)用想象力的問(wèn)題

Immunology To induce or evaluate an immune response in (an organism) by administering a specific antigen to which it has been sensitized.
【免疫學(xué)】 測(cè)試：對(duì)某有機(jī)體注入使它敏感化的特定抗原以誘導(dǎo)或評(píng)價(jià)它的免疫反應(yīng)
v.intr.（不及物動(dòng)詞）
To make or give voice to a challenge.
回應(yīng)挑戰(zhàn)
To begin barking upon picking up the scent. Used of hunting dogs.
吠叫：獵犬嗅到獸跡時(shí)發(fā)出吠叫。用于獵狗

來(lái)源：
Middle English chalenge
中古英語(yǔ) chalenge
from Old French
源自 古法語(yǔ)
from Latin calumnia [trickery, false accusation] * see calumny
源自 拉丁語(yǔ) calumnia [?；ㄕ校摷僦肛?zé)] *參見(jiàn) calumny
V., from Middle English chalengen
動(dòng)詞，源自 中古英語(yǔ) chalengen
from Old French chalangier
源自 古法語(yǔ) chalangier
from Latin calumni3ro
源自 拉丁語(yǔ) calumni3ro
from calumnia [calumny]
源自 calumnia [誹謗]

【引伸】
chal.lengeable
adj.（形容詞）