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What are the causes of semantic change?

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What are the causes of semantic change?
Please use English to explain~Thx~
semantic change is a change in one of the meanings of a word.Every word has a variety of senses and connotations which can be added,removed,or altered over time,often to the extent that words of one time period mean quite different things to the same words as spoken in a previous time.Moreover,two words derived from the same original may develop in very distinct ways:cognates across languages often look very similar but mean entirely different things.
Semantic change is not to be confused with etymology,another field in diachronic linguistics; etymology is the scientific study of word origin,while semantic change deals with the development of sense.In fact,semantic change is one of the factors that need to be taken under consideration,in order to evaluate a proposed etymology.