challenge

詳細解釋：

chal.lenge

n.（名詞）

A call to engage in a contest, fight, or competition:
挑戰：提出挑戰、競賽或競爭：
例句：
a challenge to a duel.
挑戰要求決鬥

An act or statement of defiance; a call to confrontation:
對抗：反對的言論或舉動；公然對抗：
例句：
a challenge to the government`s authority.
公然對抗政府權威

A demand for explanation or justification; a calling into question:
質疑：要求解釋或證明為正當；質疑：
例句：
a challenge to a theory.
對一項理論質疑

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

A claim that a vote is invalid or that a voter is unqualified.
選舉無效的聲明：聲稱某一投票無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：正式對某位預期的陪審員列入陪審團表示異議
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】 激發：對某有機體注入使它敏感化的特定抗原以誘導或評價它的免疫反應
v.（動詞）
chal.lenged,chal.leng.ing,chal.leng.es
v.tr.（及物動詞）

To call to engage in a contest, fight, or competition:
挑戰：提出挑戰、競賽或競爭：
例句：
challenged me to a game of chess.
以下棋向我挑戰

To invite with defiance; dare:
公然挑戰；公然反抗：
例句：
challenged him to contradict her.See Synonyms at defy
挑動他去反對她參見 defy

To take exception to; call into question; dispute:
表示異議；質疑；爭議：
例句：
a book that challenges established beliefs.
對確定的信念表示異議的書籍

To order to halt and be identified, as by a sentry.
驗明身份：（被哨兵）命令停止前進並查明身份
Law To take formal objection to (a prospective juror).
【法律】 提出反對：（對預期的陪審員）正式表示反對
To question the qualifications of (a voter) or validity of (a vote).
對（投票人的）資格或（選票的）有效性質疑
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:
運用，激勵：要求行動，努力去做，或發揮作用；激勵：
例句：
a problem that challenges the imagination.
運用想像力的問題

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】 測試：對某有機體注入使它敏感化的特定抗原以誘導或評價它的免疫反應
v.intr.（不及物動詞）
To make or give voice to a challenge.
回應挑戰
To begin barking upon picking up the scent. Used of hunting dogs.
吠叫：獵犬嗅到獸跡時發出吠叫。用於獵狗

來源：
Middle English chalenge
中古英文 chalenge
from Old French
源自 古法文
from Latin calumnia [trickery, false accusation] * see calumny
源自 拉丁語 calumnia [耍花招，虛假指責] *參見 calumny
V., from Middle English chalengen
動詞，源自 中古英文 chalengen
from Old French chalangier
源自 古法文 chalangier
from Latin calumni3ro
源自 拉丁語 calumni3ro
from calumnia [calumny]
源自 calumnia [誹謗]

【引伸】
chal.lengeable
adj.（形容詞）