海藻

例句：

1. 1. The sea is full of colorful seaweed.
   海里充满了五颜六色的海藻。
2. 2. Algae are a type of green plant that grows in water.
   藻类是一种生长在水中的绿色植物。
3. 3.Seaweed has been used for centuries as a food source and medicine.
   海藻自古以来就被用作食物来源和药物。