n.（希腊神话中的）九头蛇；难以根除之祸害；水螅
Hydra.
n.长蛇星座
This beast is Hydra, it has terrorized my seas for far too long. 这个怪兽就是九头蛇,它威胁我的海洋已经很久了。
That's weird, that rope comes out of a hydra neck? I can't even reach it! 真怪异
We may be facing a hydra that defies any easy solution. 我们也许正面临一个无法轻易解决的难题。
The bodies of the hydra and sea anemone can produce buds. 水螅和海葵的身体能产生芽。
