at、on、in有層遞關係
he is at the bed﹏指他在床附近
he is on the bed﹏指他在床上
he is in the bed﹏指他已經鑽入被窩了

所以﹏in﹏就是﹏嗯﹏ㄝ﹏
生米煮成熟飯了