conundrum

n.

谜语；难解的问题；

复数：conundrums

1. I'm going to tell you why this conundrum exists.
   我打算告诉你们为什么这个谜题存在。
2. Let me tell you what science has done with the conundrum.
   让我告诉你们科学与谜题曾有的关系。
3. It's a conundrum as it is.
   这本来就是一道难题。

The Conundrum of Sharing Research Data
The continuing conundrum of the LEA proteins
Enterococci in foods--a conundrum for food safety.
The Conundrum of Sharing Research Data (2011 Pre-Publication Manuscript)
Unravelling the conundrum of tannins in animal nutrition and health
The Cambrian conundrum: early divergence and later ecological success in the early history of animals.
The hemodialysis catheter conundrum: Hate living with them, but can|[rsquo]|t live without them
Resolving the gatekeeper conundrum: what patients value in primary care and referrals to specialists.
Eukaryotic regulatory RNAs: an answer to the ‘genome complexity’ conundrum
Targeting small Abeta oligomers: the solution to an Alzheimer's disease conundrum?