【经】 灰色地区
在线英汉词典

grey area的短语、例句：

grey area aspect, topic, etc that does not fit into a particular category, and is therefore difficult to deal with 灰色区域（不易归类故难以处理的方面、 题目等）
When the rules for police procedure were laid down, a lot of grey areas remained. 警方的程序规章定立後, 遗留下许多难以处理的灰色区域.