▲根据语义的需要，during 后面的名词可以是特指的，也可以是泛指的。如以下各句中 during 后面的名词用的是表泛指意义的不定冠词：

Innocent children are often harmed during a war. 战争期间无辜的孩子们经常受到伤害。

During an emergency, it’s important to keep your head. 紧急情况下保持镇定很重要。

He died ofa heart attack during a routine operation. 他在一次普通手术中死于心脏病。

In no case should you open a door that feels hot during a fire. 着火时，感觉门热就决不能打开。

We have a stock of candles in casethe lights go out during a storm. 我们储存蜡烛以备因暴风雨停电时应急。

▲又如以下句子中 during 后面的名词用的是零冠词，也非特指：

Electrical output sometimes doesn’t meet demand during hot weather. 天气炎热时电力输出有时不能满足需求。

My teacher likes our questions and interjections during class. 我们老师喜欢我们在课堂上提问、插话。