1835, genus name of a freshwater polyp, from Greek Hydra, many-headed Lernaean water serpent slain by Hercules (this sense is attested in English from late 14c.), from hydor "water" (see water (n.1)); related to Sanskrit udrah "aquatic animal" and Old English ottur "otter." Used figuratively for "any multiplicity of evils" [Johnson]. The fabulous beast's heads were said to grown back double when cut off, and the sea creature is said to be so called for its regenerative capabilities.
实用例句
1. 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.
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2. Week of Hydra: Double growth for Hydra and Chao Hydras.
九头蛇周: 九头蛇产量加倍.
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3. Mixed with moisturizing ingredients to maintain skin Hydra silk slip.
混合有保湿成分,维持肌肤水润丝滑.
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4. I am declaring general emergency codes Bandersnatch and Hydra.
声明全面紧急代码:想象猛兽和九头怪.
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5. It is a hydra - headed tree of unreason with a thousand roots.