helical thickening

例句：

1. 1.The growth of the tumor was accompanied bya helical thickening of theblood vessels.
   肿瘤的生长伴随着血管的螺旋增厚。
2. 2. The structure of the bone is characterizedby a helical thickening thatincreases in strength as it extends.
   骨骼的结构特征是随着延伸而增强的螺旋增厚。
3. 3. The helical thickening ofthe skin can be observed during the developmentof the hair follicles.
   在毛发毛囊发育过程中，可以观察到皮肤的螺旋增厚。