an instant

例句：

1. 1. Shehad an instant reaction to the news.
   她对这个消息有立刻的反应。
2. 2. Themovie ended in an instant.
   电影在一瞬间就结束了。
3. 3.He had a second to think before hespoke.
   他说话前有一刻时间思考。