您还可以乘船游览美丽的乌波卢礁，参观牡蛎礁。
You also have the opportunity to visit Oyster Reef as you sail out to beautiful Upolu Cay.
由牡蛎礁构成的小岛上覆盖着一层薄薄的黑色软泥。
The islands consist of oyster reefs covered with a thin veneer of black mud.
本论文为使研究更具有实践意义，对江苏海门市东灶港牡蛎礁保护区的社区环境教育模式进行了探讨。
It is practically significant to discuss the mode of the community environmental education in the Xiaomiaohong oyster reefs reservation in Dongzaogang town of Haimen city in Jiangsu Coast.
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