bladderwrack

1. Why does bladderwrack have bladders?
   泡叶藻为什么长着气泡？
2. An air-filled sac found in large numbers in the thalli of certain seaweeds ( e.g. bladderwrack).
   气囊2在一些海草的植物体中大量的发现的充满空气的囊。例如墨角藻。

noun

1. a common rockweed used in preparing kelp and as manure

   Synonym:    black rockweedbladder fucustangFucus vesiculosus

2. similar to and found with black rockweed

   Synonym:    Ascophyllum nodosum