demarcation
/ˌdi:mɑ:ˈkeɪʃn; ˌdimɑr`keʃən/ n[U, C]
(marking of a) limit or boundary, esp between types of work considered by trade unions to belong to workers in different trades 划界线; 界线; （尤指工会认为属於不同行业间的）工种界线
a line of demarcation 分界线
[attrib 作定语]
demarcation disputes in industry 工业上工种界线的纠纷.