音标：['haidrә] ；

n. 水螅, 九头蛇, 难以根除之祸害

n. (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones
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

词型变化：名词复数形式 : hydras

词性分布：

名词100%

hydra的用法和样例：

例句

用作名词(n.)

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

【近义词】

snake蛇

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听美文故事记6级单词

英语听书《海底两万里》第509期第31章章鱼(16)

What rage then drove us against these monsters! 于是我们对这些怪物愤怒至极！ We lost all self-control. 我们再也忍无可忍。 Ten or twelve devilfish had overrun the Nautilus's platform and sides. 十几条章鱼侵入了鹦鹉螺号

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《海底两万里》中英双语有声读物

英语博客：Mythology looking at me.

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英语博客 A cup of English

VOA常速英语2007年-Abu Dhabi Developer Challenges Donald Trump wit

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VOA常速英语2007年（十二月）

SSS 2011-02-01

This is Scientific Americans 60-Second Science. Im John Matson, Got a minute? Imagine a pinball machine on multi-ball modeonly the balls are the size of planets. The early solar system was such a rough-and-tumble place. That chaotic environment produ

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Scientific American(二)月

看《美国队长3》学地道口语：你升官了

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英语口语

未来冰箱洗衣机可“交谈”

A fridge that talks to your washing machine and a television that instructs your dishwasher. It's all possible at CeBIT, the world's top high-tech fair。 But the question is: what's the point? Well, for example, you could be sitting on your sofa in

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阅读空间

高智能家电：冰箱洗衣机可“对话”

A fridge that talks to your washing machine and a television that instructs your dishwasher. It's all possible at CeBIT, the world's top high-tech fair. 冰箱和洗衣机交谈、电视向洗碗机下令在世界顶级高科技展会德国汉诺威通

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实用英语

四级阅读理解判断、归纳推理

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A good lawyer must be a great liar.