介词during 只有一个意思:在……期间
只可以作状语，表示“时间”
1.He was taken to the hospital during the night.
他在夜间被送到了医院。
2.Great changes took place during the 1990s.
巨大的变化发生在二十世纪九十年代。
Wages have fallen by more than twenty percent during the past two months.薪资在过去的两个月里下降了许多。
4.There are extra flights to Hongkong during the winter.
冬季期间，有更多的航班飞往香港。
The attack is believed to have been carried out during the early morning.人们认为进攻是在一大早的时候发起的。
6.Please remain seated during the performance.
演出期间，请大家不要站着。
7.I only saw her once during my stay in Beijing.
我在北京逗留期间，只见过她一次。
注意:使用during的时候，要注意时态的特点，虽然都表示“一段时间”，但是如果强调时间终点为过去，现在，就得使用完成时。