The dolphin is an intelligent animal.
海豚是聪明的动物。
A dolphin leapt out of the water.
海豚跃出水面。
A large proportion of the dolphins in that area will eventually die
那片区域里的很大一部分海豚终将死去。
Whales and dolphins are still being slaughtered for commercial gain.
仍然有人为了商业利益大肆捕杀鲸鱼和海豚。