centella

例句：

1. 1. Centella is a small marine creature that lives in the ocean.
   海葵是一种生活在海洋中的小型生物。
2. 2.The centella has a long body and a sucker on its tail.
   这种海葵身体长，尾巴上有吸盘。
3. 3. Centella can be found in coral reefs around the world.
   海葵可以在世界各地的珊瑚礁中找到。