摘要
A bag is useful and the word "bag" is useful, too. It reminds us ofan interesting phrase (短语), i.e. "to letthe cat out of the bag". In meaning it isthe same as "to tell the secret". And
A bag is useful and the word ＂bag＂ is useful, too. It reminds us of an interesting phrase（短语）, i.e. ＂to let the cat out of the bag＂. In meaning it is the same as ＂to tell the secret＂. And there is an old interesting story about it.
