Their success may be partly attributed to the "golden rule" in which each adult spoke with them a separate language, leading the children to believe that the speaker was the language's creator.
移民外國的父母都知道，在教導幼兒語言時，有個「黃金律」（golden rule），即父母親雙方必須堅持「一個家長只說一種語言」的原則，專家認為，這有助於幼兒適應同時而來的語言。