dolphin [ˈdɒlfɪn] n. 海豚
英英解释（牛津词典）：
a sea animal (a mammal ) that looks like a large fish with a pointed mouth. Dolphins are very intelligent and often friendly towards humans. There are several types of dolphin .
海豚的特点：
- 一种海洋动物（a sea animal）
- 看起来像一条大鱼（ that looks like a large fish）
- 尖尖的嘴巴（with a pointed mouth）
海豚的属性：
- 海豚是非常聪明的（Dolphins are very intelligent）
- 对人类很友好（ and often friendly towards humans）
- 它有很多种类（There are several types of dolphin）
