Ying and lining, in modern two-syllable terms, are "anaphora" and "shadowing", which are both rhetorical or writing techniques.
Specifically:
Should: response, response. There is a sound in front and an echo behind. For example, the first half of a poem specifically describes the actual scene of autumn wind and cold rain. The second half writes about the sadness and gloom in my heart.
To set off. Most of them use opposite and different tones to highlight the theme. For example, when writing about the red of flowers, use the green of leaves to contrast; when writing about the ambition of a swan, use the insignificance of a tit to contrast.