The trick is to fill the bag of experience before you empty the bag of luck.

关键就在于，在运气袋变空之前，请把经验袋装得满满的！

youdao

So "letting the cat out of the bag" revealed the merchant's trick.

所以“让猫从袋子里出来”揭露出商贩的骗局。

youdao

Try the sleeping bag trick.

尝试睡袋的把戏。

youdao

Try the sleeping bag trick.

尝试睡袋的把戏。

youdao