《旧唐书·列传·卷一百一十六》
比如 北风其凉 ，借风来讽刺威势虐行； 雨雪霏霏 ，通过雪来哀怜征役之苦； 棠棣之华 ，用见花之感触来颂扬兄弟友情； 采采苤苡 ，借草表达有子之乐。
设如 北风其凉 ，假风以刺威虐； 雨雪霏霏 ，因雪以愍征役； 棠棣之华 ，感华以讽兄弟； 采采芣苡 ，美草以乐有子也。
For example, "The north wind is cool" uses the wind to satirize violence and abuse; "The rain and snow are heavy" uses the snow to lament the suffering of military service; "The flowers of the棠棣 tree" uses the feeling of seeing flowers to praise brotherly friendship; "Pick the leaves of the weed" uses the grass to express the joy of having children.