Some linguistic experts, dating from the early 20th century, have maintained that the best way to facilitate bilingual acquisition is to have each main input carrier (usually parents) use one and only one language with the child.
一些語言專家，從20世紀初約會時，都堅持認為，以方便雙語收購的最好辦法是讓每個主輸入載波（通常是父母）用一個且只有一個與孩子的語言。