to open or spread out something that has been folded

He watched her expression as she unfolded the letter. 他注视着她拆信时的表情。

She unfolded a deckchair and sat down. 她打开一个户外躺椅坐了下来。

If a situation or story unfolds, it develops or becomes clear to other people.

Like a lot of people, I've watched the events of the last few days unfold on TV. 和许多人一样，我这几天一直在电视上关注着事件的发展。

As the plot unfolds, you gradually realize that all your initial assumptions were wrong. 随着情节的展开，你会慢慢意识到自己最初的那些猜测都是不对的。

to tell a story or explain something such as a plan

Gradually, the author unfolds a fantastical tale. 作者将一个奇幻的故事一步步地展开。