After just three months, the kids began conversing in German. They even began calling each other "doof," German for "stupid," rather than the Chinese "ben dan" --that was fast!
結果才過了 3 個月，小孩之間就轉變為德文對話，就連罵人，也由「笨蛋」變成「doof」（蠢的），真是快呀！