hydra
noun /ˈhaɪdrə/
/ˈhaɪdrə/
- Hydra(in ancient Greek stories
古希腊神话 许德拉，多头蛇（砍去一个头即长出新头，后为大力神赫拉克勒斯所杀） - (formal) a thing that is very difficult to deal with, because it continues for a long time or because it has many different aspects
棘手的复杂事物；难以根绝的祸患 - (biology
生物 水螅
词源via Latin from Greek hudra ‘water snake’, named by Linnaeus because, if cut into pieces, each section can grow into a whole animal.