challenging

动词 challenge:

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

形容词 challenging:

1. requiring full use of your abilities or resources
   同义词：ambitious
2. stimulating interest or thought
   同义词：thought-provoking
3. disturbingly provocative
   同义词：intriguing

1. A mentally challenging problem or puzzle.
   脑筋急转弯一个考验智力的问题或难题
2. A challenging course of study; a challenging role for an inexperienced performer.
   一门挑战性的课程; 给一个无经验的演员一个挑战性的角色
3. They challenged that company's supremacy in the field of electronics.
   他们挑战那家公司在电子学领域中占据的领先地位。
4. The tyrant's domination was challenged by the rebels.
   暴君的统治受到了反叛者的挑战。