Hydra
01
水螅, 淡水息肉
a freshwater polyp with a cylindrical body and tentacles
例子
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。
02
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
03
长蛇座, 长蛇
a long faint constellation in the southern hemisphere near the equator stretching between Virgo and Cancer
04
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
