The whole island is composed of basalt rocks.It has a 2.49km long coastline and an area of 26.5 hectares.When the tide falls, it can line up with the southern archipelagos in the north.是什么意思_The whole island is composed of basalt rocks.It has a 2.49km long coastline and an area of 26.5 hectares.When the tide falls, it can line up with the southern archipelagos in the north.在线翻译_英语_读音_用法_例句