Analysis: In couplets, the ending words of the upper couplet are disyllabic (three tones and four tones), and the ending words of the lower couplet are flat tones (one tone and two tones). And the spring (chūn) in Niu Ben Roar of Kyushu Spring is a sound, and one sound belongs to a flat sound, so Niu Ben Roar of Kyushu Spring is the second part.
Couplets must have the following characteristics:
1, words are equal and sentences are consistent. In addition to deliberately leaving a place for a word to achieve a certain effect, the number of words in the upper and lower couplets must be the same, neither more nor less.
2. Be straightforward and have a harmonious tone. The traditional habit is to "pucker up and fall flat", that is, the end of the last sentence of the first couplet is puckered up and the end of the last sentence of the second couplet is flat.
3. Parts of speech should be relative and in the same position. It is generally called "virtual to virtual, real to real", which means that nouns to nouns, verbs to verbs, adjectives to adjectives, quantifiers to quantifiers, adverbs to adverbs and related words must be in the same position.
4. Be content-related, from top to bottom. The meaning of up and down links must be interrelated, but they cannot be repeated.
In addition, the traditional practice of hanging couplets must be written straight and pasted vertically, from right to left and from top to bottom, and cannot be reversed.