basal fold

例句：

1. 1. The basal fold of the skin is visible when you touch it.
   当你触摸皮肤时，基底褶皱是可见的。
2. 2.The scientist discovered a new type of bacteria that causes this basal fold.
   这位科学家发现了一种引起这种基底褶的新细菌类型。
3. 3.The basal fold in the skin is caused by the body's natural healing process.
   皮肤上的基底褶是由身体自然愈合过程引起的。