单词：hydra
n. a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
n. trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality
hydra的用法和样例：
例句
- 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。
词汇搭配
- hydra（希腊神话中的）九头...
经典引文
They are the hydra assailants which return with every hour.
出自：M. Robinson
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