protoceanic rift basin

例句：

1. 1.The protoceanic coral reefs are a popular tourist destination.
   海生珊瑚礁是一个受欢迎的旅游目的地。
2. 2.The protoceanic environment is home to many marine species.
   海生环境是许多海洋物种的家园。
3. 3.The protoceanic ocean floor is rich in minerals and nutrients.
   海生海底富含矿物质和养分。