unfold 主要指把原来包好、卷好或叠好的东西再打开。
open 普通用词，指把原来关起来或盖紧的东西打开。
参考例句
1. It is time for this dance to end and a new era to unfold! 现在是时候去结束这场舞蹈了，让一个新时代展现！
2. In the remembrance, perhaps a different future shall unfold. 在回忆中，或许一个不同的未来会展现。
3. Unfold towel and apply liberally to cool dry skin, 20 minutes prior to sun exposure. 在暴露在阳光下20分钟之前，展开毛巾涂抹在干的皮肤上面。
英英解释
v.
1. develop or come to a promising stage
2. open to the view
3. extend or stretch out to a greater or the full length
4. spread out or open from a closed or folded state
