Hydrozoa

例句：

1. 1.The hydrozoan jellyfish is a common sight in coral reefs.
   水螅形的章鱼是珊瑚礁中常见的生物。
2. 2. The hydrozoan was found to be toxic to humans.
   这种水螅对人有毒。
3. 3.The hydrozoan jellyfish is known for its ability to produce toxic stings.
   水螅形的章鱼以其产生有毒刺的能力而闻名。