Protect the mangroves; they serve as nurseries for many fish species.

保护红树林；它们是许多鱼类的育苗场。

同一单元的其他句子

• The deep sea remains one of the most unexplored regions on Earth.深海仍然是地球上最未被探索的区域之一。
• Marine biologists study the diverse ecosystems found in the ocean depths.海洋生物学家研究海洋深处发现的多样生态系统。
• How do submarines withstand the immense pressure of the deep ocean?潜艇如何承受深海的巨大压力？
• Do not underestimate the dangers of deep-sea exploration without proper equipment.不要低估没有适当设备进行深海探索的危险。
• The discovery of hydrothermal vents revolutionized our understanding of life.热液喷口的发现彻底改变了我们对生命的理解。