challenge

1.挑战；艰巨任务a new or difficult task that tests sb's ability and skill

2.挑战书；（比赛、打斗等的）邀请，提议an invitation or a suggestion to sb that they should enter a competition, fight, etc.

3.~ (to sth)质询；质疑；提出异议a statement or an action that shows that sb refuses to accept sth and questions whether it is right, legal, etc.

1.~ sth对…怀疑（或质疑）；拒绝接受to question whether a statement or an action is right, legal, etc.; to refuse to accept sth

2.向（某人）挑战；（尤指在对方不情愿时）强烈建议（某人做某事）to invite sb to enter a competition, fight, etc.; to suggest strongly that sb should do sth (especially when you think that they might be unwilling to do it)

3.~ sb考查，考验（能力和技巧）to test sb's ability and skills, especially in an interesting way

4.~ sb盘问；查问to order sb to stop and say who they are or what they are doing

1.挑战,挑战书,决斗书;(比赛等的)提议

2.艰巨任务,难题

3.要求,需求,鞭策

4.质问;怀疑,驳斥;异议

5.【法】(对陪审官等的)要求回避,表示反对,拒绝

6.(哨兵对行人的)盘问,(对飞机等的)信号盘问;口令

7.【医】(用接触致病性传染物进行的)免疫性试验

1.要求,需要;引起

2.质问;怀疑,驳斥

3.【法】对(陪审官等)要求回避,宣布反对,拒绝

4.向...挑战

5.【军】向...发出盘问口令[信号]

6.〈美〉不承认(投票人有投票资格)

7.提出挑战

8.【法】表示异议

9.(猎犬发现猎物时)吠叫

1.something that needs a lot of skill, energy, and determination to deal with or achieve, especially something you have never done before and will enjoy doing

2.an action or idea that questions whether something is true, accurate, or legal; a refusal to accept someone’s authority; a refusal to accept someone as a member of a jury

3.an invitation to someone to compete or fight, especially in a sport; used in the names of competitions, especially sports competitions

1.to question whether something is true, accurate, or legal; to refuse to accept someone’s authority; to refuse to accept someone as a member of a jury

2.to invite someone to compete or fight

3.to test someone’s skill and abilities

4.if you are challenged by someone, they ask you who you are and why you are in a particular place