Downward: before the front door taxi is rented.

2. Shanglian: Shanghai tap water comes from the sea.

Bottom line: Larix gmelinii leaves in Huangshan Mountain are yellow.

3. Shanglian: Shanghai tap water comes from the sea.

Downward: Down the mountain, under Mamu Mountain in the shepherd.

4. Shanglian: Shanghai tap water comes from the sea.

Downward: Shanxi coal truck transports coal to Xishan.

Extended data:

The origin of development

Couplets, also known as antithesis, antithesis, spring stickers, Spring Festival couplets, couplets, Taofu and couplets (named after the pillars hanging in halls and houses in ancient times), are a kind of dual literature, which originated from Taofu. It is a antithetical sentence written on paper, cloth or engraved on bamboo, wood and columns. It is a unique art form of Chinese, concise and profound, neat and even, with the same number of words and the same structure.

Parallel prose and rhyme are two direct sources of couplets. In the process of its own development, couplets have absorbed the characteristics of ancient poems, essays, lyrics and songs. Therefore, the sentence patterns used in couplets include ancient poems, prose sentences and parody sentences in addition to regular poems and parallel prose sentences.