The dolphin is an intelligent animal.

　　海豚是聰明的動物。

　　A dolphin leapt out of the water.

　　海豚躍出水面。

　　A large proportion of the dolphins in that area will eventually die

　　那片區(qū)域里的很大一部分海豚終將死去。

　　Whales and dolphins are still being slaughtered for commercial gain.

　　仍然有人為了商業(yè)利益大肆捕殺鯨魚和海豚。