Conundrums

n.

谜，猜不透的难题，难答的问题( conundrum的名词复数 )；

Conundrums
Conundrums
Conundrums
Some conundrums concerning separation of duty
Conundrums in mixed woody-herbaceous plant systems.
An A to Z guide to DSM-IV conundrums.
Special Paper: Conundrums in Mixed Woody-Herbaceous Plant Systems
Peroxisome biogenesis: advances and conundrums
Understanding Apomixis: Recent Advances and Remaining Conundrums
Cerebral asymmetry and emotion: Conceptual and methodological conundrums
Domestic violence and mental health: Correlates and conundrums within and across cultures.
Find-me and eat-me signals in apoptotic cell clearance: progress and conundrums
Tissue inhibitors of metalloproteinases and programmed cell death: conundrums, controversies and potential implications