poser

n.

难题；困难；棘手的事；装腔作势的人

复数：posers

1. The dilemma presented quite a poser.
   困境给人很大的难题。
2. He's such a poser on the dance floor.
   他在舞池里真会卖弄风情的。
3. Who does she think she is? A singer star? What a poser!
   她以为她是谁呢?歌星?真是耍大牌啊?

A new variant of Creutzfeldt-Jakob disease in the UK.
Notch signalling regulates stem cell numbers in vitro and in vivo.
Skeletal repair by in situ formation of the mineral phase of bone
Cross talk between ERK and PKA is required for Ca2+ stimulation of CREB-dependent transcription and ERK nuclear translocation
Phenotypic profiling of the human genome by time-lapse microscopy reveals cell division genes
Characterization of a gamma-carboxyglutamic acid-containing protein from bone.
Detection of 14-3-3 protein in the cerebrospinal fluid supports the diagnosis of Creutzfeldt-Jakob disease.
Induction of CRE-mediated gene expression by stimuli that generate long-lasting LTP in area CA1 of the hippocampus.
Free radicals in cerebral ischemia.
BAC TransgeneOmics: a high-throughput method for exploration of protein function in mammals