an area of a subject or situation that is not clear or does not fit into a particular group and is therefore difficult to define or deal with灰色地带，中间区域（界线不明、不易归类、难以界定或处理的领域或形势）
Exactly what can be called an offensive weapon is still a grey area.究竟什么可称作攻击性武器仍然难以界定。🔊🔊
The new rules for police procedure cleared up a lot of grey areas.新的警察程序规则清除了许多灰色区域。