"Dolphin" 是海豚的英文名称。这个词来源于希腊语，由 "delphis" 和 "delphus" 组成，意思是 "鲸" 或 "海豚"。
例句：
"The dolphins were jumping out of the water and playing with each other." (海豚跳出水面，彼此玩耍。)
"I saw a pod of dolphins swimming near the shore." (我看到一群海豚在海岸附近游泳。)
"Dolphins are known for their intelpgence and playful nature." (海豚以其聪明和嬉戏性质而闻名。)