the demarcation of the boundary界线的划定

Troops are positioned on either side of the line of demarcation. = Troops are positioned on either side of the demarcation line.军队驻扎在分界线的两侧。

The media has blurred the demarcations [=lines, boundaries] between news and entertainment.媒体混淆了新闻与娱乐之间的界线。