What does language transfer mean in English?

Language transfer refers to the phenomenon that learners express their thoughts with the help of the pronunciation, meaning, structural rules or habits of their mother tongue when using a second language. If the language rules of the mother tongue are consistent with those of the foreign language, then the rule transfer of the mother tongue will have a positive impact on the target language. This is the so-called positive transfer, that is, if the language rules of the mother tongue do not conform to the habits of foreign languages, it will have a negative impact on foreign language learning. Language transfer can be used to explain the language contact and language changes between different nationalities in history.