erect fold

例句：

1. 1.The tall building has a very elegant upright fold in its facade.
   这座高楼的立面非常优雅，有一道直立褶。
2. 2.The designer used this upright fold to create the illusion of depth and volume.
   设计师利用这个直立褶创造出深度和体积的错觉。
3. 3.The fabric is made from a special material that can be easily manipulated into various upright folds.
   这种织物是由一种特殊材料制成的，可以轻松地被塑造成各种直立褶。