sheath fold

例句：

1. 1. The sheath fold on the sleeve of this shirt is so tight that it's uncomfortable to wear.
   这件衬衫袖子上的护套折叠太紧了，穿着不舒服。
2. 2. The sheath fold in the leather jacket is designed to protect the zipper from getting caught.
   皮夹克的护套折叠设计用来保护拉链不被卡住。
3. 3. The sheath fold on the table is perfect for storing small items like pens and pencils.
   桌子上的护套折叠非常适合存放笔和铅笔等小物品。