- (of academic research) question and argue repeatedly
- 问难癖: folie du pourquoi
- 执经问难: holding the classics and making inquiries -- inquiries of pupils
- 质疑问难: ask doubtful questions and inquire into difficult problems; raise doubts and difficult questions for discussion
- 问难癖, 疑问性精神病: folie du pourquoi
- 问男人: askmen
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