不是同類,sea指的是海洋,island指的是島嶼,例如:
1、There are many different sorts of animal on the island.島上有許多不同種類的動物。
2、There is a shortage of fresh water on the island.島上缺少淡水。
3、The new airport will improve communications between the islands.新機場將改善島嶼間的交通聯絡。