Think of one clean stroke of a blade. The cut goes all the way through, the edge is smooth, and the two sides come apart with nothing ragged left in between. English uses that picture for ideas: a clear-cut rule or difference separates , so nobody has to argue about the middle. It also uses it for land, where the cutting was so complete that a bare patch stands out inside the forest.
可以想成一刀乾淨地切下去。切口平整，兩邊分得開，中間沒有拖泥帶水的毛邊。英文把這個畫面用在判斷上：a clear-cut rule、a clear-cut distinction，都是「界線清楚到不用爭」。所以它的否定 not clear-cut 特別常見，意思是中間有一塊模糊地帶。同樣的畫面也被用在土地上：一整片林子砍到一棵不留，森林中間就切出一塊光禿禿的區塊。
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