For example:
Extended data:
In addition to rich meanings and images, traditional couplets also require neat antithesis, catchy rhythm, uniformity and harmony. Simply put, duality is noun to noun, verb to verb, adjective to adjective and so on. Prosodically speaking, it is easy to read, not awkward. The flat line emphasizes that the upper part and the lower part are relative. There is a saying that "135 doesn't matter, 246 is clear", which means that as long as the words on even numbers are flat and relative. But traditionally, the requirement for the bottom line must be flat, that is, the last sentence of the top line is flat and the last sentence of the bottom line is flat. Generally speaking, in Pinyin, a flat tone (one tone with two tones) is a flat tone, and an upper tone is a flat tone (three tones with four tones) is a flat tone.