Usually, the word meaning is judged according to the dictionary, and the translation is combined with the grammar of two languages. This involves how people understand the lexical and grammatical connections between two unfamiliar languages. The most basic way is to use a common third language, which can be a "practical" third language, such as French (18 and 19 century European diplomatic circles), Latin (19 century European academic circles before) or Arabic (for example, then we can teach each other grammar through the basic vocabulary of the third language or the two languages, which Another situation is that people who can speak one language (such as soldiers in China) are unfortunately exiled (such as prisoners of war in the western regions). Over time, through mutual communication (which is very difficult), they will eventually learn to speak a second language, and this person (China prisoner of war) will unconsciously become a natural translator. I am a translator and my opinions are purely personal. If you feel good, please add points. Thank you~