群岛

例句：

1. 1.The island is surrounded by the sea.
   这个岛屿被大海包围。
2. 2. There are many islands in this region.
   这个地区有许多岛屿。
3. 3. The island was once covered in trees and grass.
   这个岛屿曾经覆盖着树木和草地。