铅笔画不出的界限橡皮擦不掉的距离
[qiān bĭ huà bù chū de jiè xiàn xiàng pí cā bù diào de jù lí]
'Borders Untraceable by Pencil and Distances Inerasable by Eraser.' These words convey a concept similar to unreachable or intangible separations between individuals in terms of physical or emotional boundaries. They cannot be clearly drawn and defined nor can they be erased or removed once established, symbolizing obstacles within interpersonal interactions which are hard to overcome.