during : 侧重指习惯性的某一段时间，而for指特定的某一段时间。during指继续的时间概念，突出事件发生的时刻，而for侧重事件持续时间的总长度。
- They work during the night and sleep by day.
- There were huge advances in aviation technology during the Second World War.
- What did you buy him for Christmas?
- I'd like an appointment with the doctor for some time this week.
- We're having a party for Jim's 60th birthday.
- I've booked a table at the restaurant for nine o'clock.