This method is called correct writing. Often used in ancient poetry, it is generally to express the feelings of A to B, but to the extreme, B has deep feelings for A, and the correct writing is a kind of bending pen, which can express feelings more tactfully, tactfully and moving. It is different from the previous description and can be understood as a side description.
This usage is well reflected in Du Fu's Moonlit Night, but the writing method is not involved in the syllabus, so it is generally not tested in the exam.