freshwater hydra

短语

词形变化

freshwater hydras 复数 freshwater hydras

释义与例句

n.
  1. 1.

    A solitary polyp, of species Hydra vulgaris, similar to a sea anemone consisting of a hollow cylinder about 10 mm long with a mouth surrounded by tentacles, usually found attached to the under surfaces of water plants in ponds and streams.