名詞 hydra:

1. (Greek mythology) monster with nine heads; when struck off each head was replaced by two new ones
   同義詞：Hydra
2. a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
   同義詞：Hydra, Snake
3. trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality
   同義詞：hydra
4. small tubular solitary freshwater hydrozoan polyp
   同義詞：hydra

1. A constellation in the Southern Hemisphere near Hydra and Corvus.
   巨爵座南天球的一個星座，位于長蛇座和烏鴉座附近