### Chinese: 那么大家肯定会问：为什么袋装保质期是一年，而听装的保质期是两年或更长呢？
### English: So everyone will surely ask: Why is the shelf life of bags is one year while the shelf life of cans is two years or more?
### Errors: There is a major error at "everyone". There is a major error at "is". There is a major error at "she". There is a major error at "of bags is".

### Improved English: Then you may ask: why is the shelf life of milk powder one year in bags and two years or longer in cans?