hydroma

例句：

1. 1. The jellyfish was so large that it could have been mistaken for a small ship.
   这个水母太大了，可以和一艘小船混淆。
2. 2.The hydra is a fascinating creature that can regenerate lost limbs.
   水母是一种令人着迷的生物，它可以再生失去的肢体。
3. 3. Hydrocortis is a common anti-inflammatory medication used to treat skin conditions.
   氢化可的松是一种常见的抗炎药物，用于治疗皮肤疾病。