It was as though an invisible hand had twisted Harry's intestines and held them tight.
似乎有一双无形的手紧紧地揪住了哈利的五脏六腑。
英语百科
Volvulus
The term volvulus has its roots from medieval Latin "volvere"; which means "to roll".
A volvulus is a subtype of malrotation, in which a loop of bowel is twisted about a focal point along the mesentery attached to the intestinal tract, that may result in a bowel obstruction.