What is an antithetical sentence?

Pairing of two phrases or sentences with the same or similar structure, the same number of words and related meanings is called antithesis. For example, silkworms in spring will weave until they die, and candles will drain the wick every night. These two sentences have the same structure (both subject-predicate sentences), the same number of words, the opposite parts of speech and complementary meanings, which is a very neat dual. The two sentences that constitute duality can explain the same thing from two angles and two sides, and complement each other in content, which is the opposite. For example, in the Tang Dynasty, Zhang said that looking at the bridge from a distance was like "the clouds rose in the first month and Changhong drank a stream". The two metaphors of "Yun Qi at the beginning of the month, Changhong drinking the stream" illustrate the characteristics of the stone arch bridge from different angles, which are very vivid and correct. Two sentences that constitute duality can explain the same thing from two aspects: positive and negative opposition. They are opposite or relative in content, which is opposition. For example, frown at a thousand fingers and bow your head as a willing ox. These two sentences have neat objections, showing Lu Xun's two completely different attitudes towards the enemy and the people. Duality has long been used in China's ancient poems. For example: (1) The sand sea deepens, the ice is unfathomable, the clouds are overcast, and the Wan Li condenses. (2) Qian Fan is on the side of the sunken ship, and Wan Muchun is in front of the diseased tree. (3) Several early warblers compete for warm trees, and new swallows peck at spring mud. (4) one water protects the field, and two mountains send green. These duality is very strict, not only the number of words is equal, but also the structure is relative. The flat changes between words in the same sentence are corresponding, and the relational words between the upper and lower sentences have the same part of speech. Modern articles have more extensive requirements for duality. For example: (1) All kinds of substances in nature are moving all the time: they are dying here and growing there; It's under construction here and it's being destroyed there. (2) There were white clouds just now, and the sun was shining; In a blink of an eye, it was cloudy and raining cats and dogs. There are repeated words in the upper and lower clauses of the first sentence, and the parts of speech in the upper and lower clauses of the second sentence are not exactly the same, but these two sentences are dual, but the requirements are not so strict.