[N-COUNT 可数名词]海豚 A dolphin is a mammal which lives in the sea and looks like a large fish with a pointed mouth.
Oxford
dol·phin/ˈdɒlfɪn; NAmEˈdɑːlfɪn/nouna sea animal (a mammal) that looks like a large fish with a pointed mouth. Dolphinsare very intelligent and often friendly towards humans. There are several types of dolphin.海豚◆a school of dolphins一群海豚☞compare