challenge 的基本释义是“挑战”
Teaching adolescents can be quite a challenge. (可数名词)
教育青少年是相当大的挑战。
The ski slope offers a high degree of challenge. (不可数名词,此时为泛指一般性的挑战,注意challenge前不加the)
这个滑雪坡道具有相当大的挑战性。
如果“挑战”某人的权威、想法,那就有质疑方面的意思
Both teachers have had to deal with many challenges to their authority. (可数名词)
两位教师都曾不得不应对对他们的权威的诸多质疑。
The new data challenges many old assumptions. [=the new data gives people reasons to doubt many old assumptions](及物动词)
新的数据对过去的许多假设提出了质疑。
如果“挑战”某人,告诉对方不服就干,就是向某人下战书,邀约比赛方面的意思
Do you accept my challenge to a game of chess? (可数名词)
你接受下一盘棋的邀请吗?
I challenge you to a game of chess. (及物动词)
我向你挑战下国际象棋。
如果被一个安保人员“挑战”,就有盘问方面的意思
The intruder fled at the sentry's challenge. (可数名词)
闯入者在接受哨兵盘问时逃走了。
The sentry challenged the stranger at the gate. (及物动词)
哨兵在大门口对陌生人进行查问。
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