Hydra
01
水螅, 淡水息肉
a freshwater polyp with a cylindrical body and tentacles
例子
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
