0 from the beginning to the end of a particular period -- 在…期間
1 at some time between the beginning and the end of a period -- 在…期間的某個時候
The (traffic) congestion in the city gets even worse during the summer.
The work that the students do during the year will count towards their final degrees.
The city centre's quite lively during the day, but it's totally dead at night.
Jean was my roommate during our first year at university.
Rain will become more general in the southeast during the afternoon.
