powder keg (powderkegs)

• 1.  

  N-COUNT（可数名词） If you describe a situation or a place as a powder keg, you mean that it could easily become very dangerous. 火药桶; 危急的形势或地方

  例：

  Unless these questions are solved, the region will remain a powder keg.

  除非这些问题得以解决，否则该地区会一直是个火药桶。