Although ... but ... this related word plays a turning point, emphasizing the latter clause.
In "although ... but ...", "although" can be used before or after the subject and in the prepositional clause to express concession, connect the existing facts and affirm or admit a certain fact.
The use of "but" in the last clause leads to another fact with the opposite meaning. It can connect clauses or sentences, and then there can be a big pause.
Most conjunctions and phrases are connected by modifiers. There can be no pause after "but", and adverbs such as "que" and "Huan" can be added. The "although" in this sentence pattern can be omitted, and the "but" can not be omitted when it means that the existing facts are not enough to affect the following discussion.
Although ... but the characteristics of ...:
1. Related words, as words that connect clauses and express relationships, always express abstract relationships and can be used as concrete form signs of some compound sentences.
It's easy to find one or two necessary words when you speak. Although the meaning is different, it feels very comfortable to be together. Connect the clauses to make it a smooth and complete sentence.