Language Difficulty Ranking · The Foreign Service Institute (FSI) has created a list to show the approximate time you need to learn a specific language as an ... ... <看更多>
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Language Difficulty Ranking · The Foreign Service Institute (FSI) has created a list to show the approximate time you need to learn a specific language as an ... ... <看更多>
... <看更多>
Language Difficulty Ranking The Foreign Service Institute (FSI) has created a list to show the approximate time you need to learn a specific language as an. ... <看更多>