A call to combat, as to a duel; an invitation to a contest, as a debate.

挑战(如决斗)；竞赛之邀请(如辩论)。

A letter containing such a summons.

挑战书。

A demand for the countersign by a soldier on sentry duty.

哨兵口令；盘问暗号。

Calling into question.

质疑要求解释。

The quality of demanding competitive action, interest, or thought.

挑战性。

Objection to the seating of a juror.

【法】(对挑选陪审员等的)异议。

To summon, as to a contest or due.

挑战(如竞赛或决斗)。

To call into question, esp. for verification, explanation, etc.

质疑(要求解释、证实)。

To claim as due.

要求(应得之权利)。

To demand the countersign from.

盘问口令。