铅笔画不出的界限橡皮檫不掉的距离

This username, 'The boundary that pencils cannot draw and the distance that erasers cannot erase,' implies complex yet indescribable or irreversible feelings or situations between people. It metaphorically uses pencils and erasers, common stationery tools, to suggest boundaries and relationships that can't be easily defined or undone. Pencils may represent attempts at expressing thoughts or defining relations, while erasers suggest efforts to delete those definitions. Despite this, there exist feelings or distances that these simple tools can't capture or change.