水螅

例句：

1. 1. The jellyfish is a common sight in the ocean.
   海蜇是海洋中常见的景象。
2. 2. The water hyacinth grows quickly and can be used for landscaping.
   水葫芦生长迅速，可用于园林景观。
3. 3. Hydroids are fascinating creatures that live in shallow waters.
   水螅是一种迷人的生物，生活在水中浅处。