hyd
ra
复数形式
hydras
1
水螅, 淡水息肉
a freshwater polyp with a cylindrical body and tentacles
- Researchers observed a hydra attached to the underside of a leaf in the pond, its tentacles swaying gently in the water.
研究人员观察到一只水螅附着在池塘中叶子的下侧，其触手在水中轻轻摇摆。
- In the lab, students conducted experiments to study the feeding behavior of the hydra.
在实验室里，学生们进行了实验来研究水螅的摄食行为。
- The textbook described the unique reproductive capabilities of the hydra, which can reproduce asexually by budding.
教科书描述了水螅独特的繁殖能力，它可以通过出芽无性繁殖。
- Under the microscope, the intricate structure of the hydra's tentacles became visible, revealing its feeding mechanisms.
在显微镜下，水螅触手的复杂结构变得可见，揭示了它的摄食机制。
- In the ecosystem, the hydra plays a role as a primary consumer, feeding on small organisms and contributing to nutrient cycling.
在生态系统中，水螅作为初级消费者，以小型生物为食，并促进营养循环。
2
九头蛇, 持续的问题
trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality
3
长蛇座, 长蛇
a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
同义词：
4
九头蛇, 勒拿九头蛇
a mythical serpent-like creature in Greek mythology that has multiple heads, and if one head is cut off, two more will grow in its place
The hydra is a mythical creature from Greek mythology, often depicted as a serpent-like monster with multiple heads. According to legend, when one of its heads is cut off, two more grow in its place, making it extremely difficult to defeat. The hydra is best known from the story of Hercules, who had to kill it as one of his Twelve Labors. The creature is usually associated with destruction and chaos, symbolizing an overwhelming threat that seems to multiply when attacked.