Yet except in the few countries where many languages are spoken, such environments are difficult to find at home, requiring students to create their own.
學校與生活的語言環境能雙管齊下，當然最理想；但放諸四海，除了歐洲多語系國家以及特殊雙語或三語家庭外，直接生活在語言環境裡，實在可遇不可求。因此語言學家退而求其次，要求學語言的人要刻意去「製造」語言環境。